Revert "Revert "Adjust Subzero CMAKE=1 build to also use libc++ (like autoconf).""

This reverts commit a73408832dd716c3d076fe7f612194de614d7eee.

I reverted the wrong patch!

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4138

Review URL: https://codereview.chromium.org/1089323005
1 file changed