Fix link error with busybox and glibc

Fix link error with busybox and glibc

A recent change to ppapi_simple in the SDK caused the link
to start failing.  This change fixes the issue and also
updates the build system so that all settings are passed
in at defconfig time, and also switches to using nacl-spawn
rather than ppapi_simple directly.

Also, an a simple test.

Committed: https://chromium.googlesource.com/external/naclports/+/083908e749b3ab3d0cc1feb61280b057737bd645

[Sam Clegg, 2015-10-26 19:01:41]

The CQ bit was checked by sbc@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-26 19:01:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1418623008/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1418623008/20001

[Sam Clegg, 2015-10-26 19:01:50]

sbc@chromium.org changed reviewers:
+ bradnelson@chromium.org

[Sam Clegg, 2015-10-26 19:02:20]

Description was changed from

==========
Fix link error with busybox and glibc

A recent change to ppapi_simple in the SDK caused the link
to start failing.  This change fixes the issue and also
updates the build system so that all settings are passed
in at defconfig time.

Also, an a simple test.
==========

to

==========
Fix link error with busybox and glibc

A recent change to ppapi_simple in the SDK caused the link
to start failing.  This change fixes the issue and also
updates the build system so that all settings are passed
in at defconfig time, and also switches to using nacl-spawn
rather than ppapi_simple directly.

Also, an a simple test.
==========

[commit-bot: I haz the power, 2015-10-26 19:08:07]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-26 19:08:08]

Dry run: This issue passed the CQ dry run.

[bradn, 2015-10-26 19:09:12]

bradnelson@google.com changed reviewers:
+ bradnelson@google.com

[bradn, 2015-10-26 19:09:12]

lgtm

[bradn, 2015-10-26 19:09:18]

The CQ bit was checked by bradnelson@google.com

[commit-bot: I haz the power, 2015-10-26 19:09:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1418623008/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1418623008/20001

[commit-bot: I haz the power, 2015-10-26 19:10:56]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/external/naclports/+/083908e749b3ab3d0cc1fe...