PPC: Force PPC linux to use gcc and gcc 4.8.3 changes for AIX

PPC: Force PPC linux to use gcc and gcc 4.8.3 changes for AIX

- We don't have clang for PPC, force use of gcc.
- Changes needed to compile/build on AIX with gcc 4.8.3 missed
from last review

	modified:   build/standalone.gypi

R=danno@chromium.org, svenpanne@chromium.org

BUG=

Committed: https://crrev.com/a7bb84a452ec80f1d5baaffc2c122e98e8127227
Cr-Commit-Position: refs/heads/master@{#27254}

[michael_dawson, 2015-03-17 00:51:04]

Use gcc instead of clang for PPC and changes to allow
build with gcc 4.8.3 for AIX missed from last review

[Sven Panne, 2015-03-17 07:32:40]

svenpanne@chromium.org changed reviewers:
+ jochen@chromium.org

[Sven Panne, 2015-03-17 07:32:40]

LGTM, but it would be good if Jochen had a look, too...

[jochen (gone - plz use gerrit), 2015-03-18 08:06:19]

lgtm

[Sven Panne, 2015-03-18 08:07:55]

The CQ bit was checked by svenpanne@chromium.org

[commit-bot: I haz the power, 2015-03-18 08:08:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1018543003/1

[commit-bot: I haz the power, 2015-03-18 08:42:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-18 08:42:35]

Patchset 1 (id:??) landed as
https://crrev.com/a7bb84a452ec80f1d5baaffc2c122e98e8127227
Cr-Commit-Position: refs/heads/master@{#27254}