Revert of Bring back compiling third_party/libpng in public.bzl

Revert of Bring back compiling third_party/libpng in public.bzl (patchset #3 id:40001 of https://codereview.chromium.org/2044703006/ )

Reason for revert:
Breaking Google3

Original issue's description:
> Bring back compiling third_party/libpng in public.bzl
> 
> Disable the optimizations for simplicity, as suggested in [1].
> 
> Remove PNG_SKIP_SETJMP_CHECK, which is not defined in version 1.6.22.
> 
> [1] https://codereview.chromium.org/2033063003/diff/20001/public.bzl#newcode84
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2044703006
> 
> Committed: https://skia.googlesource.com/skia/+/e6939c15dc0c09f1348988dc56e50b6bea27b7ce

TBR=benjaminwagner@google.com,msarett@google.com,mtklein@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://skia.googlesource.com/skia/+/7732c0cae7403639ad0ce88b8f06d9030ee1ca84

[scroggo, 2016-06-22 14:25:10]

The CQ bit was checked by scroggo@google.com

[scroggo, 2016-06-22 14:25:11]

Created Revert of Bring back compiling third_party/libpng in public.bzl

[commit-bot: I haz the power, 2016-06-22 14:25:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2090643002/1

[commit-bot: I haz the power, 2016-06-22 14:25:18]

Description was changed from

==========
Revert of Bring back compiling third_party/libpng in public.bzl (patchset #3
id:40001 of https://codereview.chromium.org/2044703006/ )

Reason for revert:
Breaking Google3

Original issue's description:
> Bring back compiling third_party/libpng in public.bzl
> 
> Disable the optimizations for simplicity, as suggested in [1].
> 
> Remove PNG_SKIP_SETJMP_CHECK, which is not defined in version 1.6.22.
> 
> [1] https://codereview.chromium.org/2033063003/diff/20001/public.bzl#newcode84
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2044703006
> 
> Committed:
https://skia.googlesource.com/skia/+/e6939c15dc0c09f1348988dc56e50b6bea27b7ce

TBR=benjaminwagner@google.com,msarett@google.com,mtklein@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of Bring back compiling third_party/libpng in public.bzl (patchset #3
id:40001 of https://codereview.chromium.org/2044703006/ )

Reason for revert:
Breaking Google3

Original issue's description:
> Bring back compiling third_party/libpng in public.bzl
> 
> Disable the optimizations for simplicity, as suggested in [1].
> 
> Remove PNG_SKIP_SETJMP_CHECK, which is not defined in version 1.6.22.
> 
> [1] https://codereview.chromium.org/2033063003/diff/20001/public.bzl#newcode84
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2044703006
> 
> Committed:
https://skia.googlesource.com/skia/+/e6939c15dc0c09f1348988dc56e50b6bea27b7ce

TBR=benjaminwagner@google.com,msarett@google.com,mtklein@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed:
https://skia.googlesource.com/skia/+/7732c0cae7403639ad0ce88b8f06d9030ee1ca84
==========

[commit-bot: I haz the power, 2016-06-22 14:25:19]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/7732c0cae7403639ad0ce88b8f06d9030ee1ca84