Fix broken macro checking in the libc++ Makefile, introduced in r241909. This caused -std=c++0x not to be passed to the build by default.
Fix broken macro checking in the libc++ Makefile, introduced in r241909.
This caused -std=c++0x not to be passed to the build by default.

Pointy hat to:	dim
MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase