Enable colored diagnostics in ninja builds when building with gcc 4.9+.

GCC has supported -fdiagnostics-color since 4.9.

https://reviews.llvm.org/D47083


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332793 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed