Revert of [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts

Revert of [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts (patchset #2 id:20001 of https://codereview.chromium.org/1572753002/ )

Reason for revert:
This patch (as-is) causes a dependency on the system libc++ which breaks the toolchain on OSX.
I have a better (for the short term) fix for this.

Original issue's description:
> [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
> 
> Our Mac buildbots recently started using a different SDK, and our local build
> of libc++ doesn't work with that SDK. Instead of fixing it, we can just
> use the libc++ that recently started shipping with the clang we use to
> build the toolchain (and Chrome).
> So on Mac hosts, continue using the -stdlib=libc++ flag, but do not build,
> use, or upload our local libc++.
> 
> R=mcgrathr@chromium.org, stichnot@chromium.org
> 
> Committed: https://chromium.googlesource.com/native_client/src/native_client/+/a1f591d21f3989e78f7805d7d2d92e6fb3a3f2a4

TBR=mcgrathr@chromium.org,stichnot@chromium.org
NOTRY=true
NOTREECHECKS=true

Committed: https://chromium.googlesource.com/native_client/src/native_client/+/a52204c9b2b32f5cef75ffa43242b914b2706924

[Derek Schuff, 2016-01-20 17:44:37]

Created Revert of [PNaCl toolchain] Stop building and using custom libc++ for
OSX hosts

[commit-bot: I haz the power, 2016-01-20 17:44:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1608263003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1608263003/1

[Derek Schuff, 2016-01-20 17:48:32]

Description was changed from

==========
Revert of [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
(patchset #2 id:20001 of https://codereview.chromium.org/1572753002/ )

Reason for revert:
This patch (as-is) causes a dependency on the system libc++ which breaks the
toolchain on OSX.
I have a better (for the short term) fix for this.

Original issue's description:
> [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
> 
> Our Mac buildbots recently started using a different SDK, and our local build
> of libc++ doesn't work with that SDK. Instead of fixing it, we can just
> use the libc++ that recently started shipping with the clang we use to
> build the toolchain (and Chrome).
> So on Mac hosts, continue using the -stdlib=libc++ flag, but do not build,
> use, or upload our local libc++.
> 
> R=mcgrathr@chromium.org, stichnot@chromium.org
> 
> Committed:
https://chromium.googlesource.com/native_client/src/native_client/+/a1f591d21...

TBR=mcgrathr@chromium.org,stichnot@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
==========

to

==========
Revert of [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
(patchset #2 id:20001 of https://codereview.chromium.org/1572753002/ )

Reason for revert:
This patch (as-is) causes a dependency on the system libc++ which breaks the
toolchain on OSX.
I have a better (for the short term) fix for this.

Original issue's description:
> [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
> 
> Our Mac buildbots recently started using a different SDK, and our local build
> of libc++ doesn't work with that SDK. Instead of fixing it, we can just
> use the libc++ that recently started shipping with the clang we use to
> build the toolchain (and Chrome).
> So on Mac hosts, continue using the -stdlib=libc++ flag, but do not build,
> use, or upload our local libc++.
> 
> R=mcgrathr@chromium.org, stichnot@chromium.org
> 
> Committed:
https://chromium.googlesource.com/native_client/src/native_client/+/a1f591d21...

TBR=mcgrathr@chromium.org,stichnot@chromium.org
NOTRY=true
NOTREECHECKS=true
==========

[Derek Schuff, 2016-01-20 17:49:31]

The CQ bit was unchecked by dschuff@chromium.org

[Derek Schuff, 2016-01-20 17:50:13]

The CQ bit was checked by dschuff@chromium.org

[commit-bot: I haz the power, 2016-01-20 17:50:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1608263003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1608263003/1

[commit-bot: I haz the power, 2016-01-20 17:51:35]

Description was changed from

==========
Revert of [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
(patchset #2 id:20001 of https://codereview.chromium.org/1572753002/ )

Reason for revert:
This patch (as-is) causes a dependency on the system libc++ which breaks the
toolchain on OSX.
I have a better (for the short term) fix for this.

Original issue's description:
> [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
> 
> Our Mac buildbots recently started using a different SDK, and our local build
> of libc++ doesn't work with that SDK. Instead of fixing it, we can just
> use the libc++ that recently started shipping with the clang we use to
> build the toolchain (and Chrome).
> So on Mac hosts, continue using the -stdlib=libc++ flag, but do not build,
> use, or upload our local libc++.
> 
> R=mcgrathr@chromium.org, stichnot@chromium.org
> 
> Committed:
https://chromium.googlesource.com/native_client/src/native_client/+/a1f591d21...

TBR=mcgrathr@chromium.org,stichnot@chromium.org
NOTRY=true
NOTREECHECKS=true
==========

to

==========
Revert of [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
(patchset #2 id:20001 of https://codereview.chromium.org/1572753002/ )

Reason for revert:
This patch (as-is) causes a dependency on the system libc++ which breaks the
toolchain on OSX.
I have a better (for the short term) fix for this.

Original issue's description:
> [PNaCl toolchain] Stop building and using custom libc++ for OSX hosts
> 
> Our Mac buildbots recently started using a different SDK, and our local build
> of libc++ doesn't work with that SDK. Instead of fixing it, we can just
> use the libc++ that recently started shipping with the clang we use to
> build the toolchain (and Chrome).
> So on Mac hosts, continue using the -stdlib=libc++ flag, but do not build,
> use, or upload our local libc++.
> 
> R=mcgrathr@chromium.org, stichnot@chromium.org
> 
> Committed:
https://chromium.googlesource.com/native_client/src/native_client/+/a1f591d21...

TBR=mcgrathr@chromium.org,stichnot@chromium.org
NOTRY=true
NOTREECHECKS=true

Committed:
https://chromium.googlesource.com/native_client/src/native_client/+/a52204c9b...
==========

[commit-bot: I haz the power, 2016-01-20 17:51:36]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/native_client/src/native_client/+/a52204c9b...

[Jim Stichnoth, 2016-01-20 18:21:35]

LGTM.  The trybots look awesome! :)