Build in C++11 mode on Unix-like bots.

Mac and Windows bots are already building in C++11 mode.
This turns on the rest, mostly to see what work remains.

This will probably break a few bots.  It'd be nice if we could let those
all come in as red before reverting this so I can see the full list to fix.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/779e49602a9c8f4d2799504822e01bcafbcaa534

CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu13.10-GCC4.8-NaCl-Release-Trybot,Build-Mac10.7-Clang-Arm7-Debug-iOS-Trybot

Review URL: https://codereview.chromium.org/868233008
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