CMake: remove -fcolor-diagnostics Ninja workaround
CMake: remove -fcolor-diagnostics Ninja workaround

This can be done non-intrusively using:
    cmake -G Ninja -DCMAKE_CXX_FLAGS=-fcolor-diagnostics ..

google/cctz,Jellybooks/cctz,Jellybooks/cctz,Jellybooks/cctz,google/cctz