Remove stdc++ from libraries
Remove stdc++ from libraries

For memory sanitizer support, the LLVM libc++ needs to be used instead
of the gcc standard library.
It does not seem necessary to explicitely list stdc++, so remove it.

googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc