Windows: support static CRT runtime in CMakeLists.txt

[KindDragon]

Something like that https://github.com/grpc/grpc/blob/master/cmake/msvc_static_runtime.cmake

[dmah42]

Can someone explain the potential benefit? I'm finding it hard to have an opinion without understanding what problem this solves.

[scott-ferguson-unity]

The MSVC static/dynamic CRT's aren't compatible so the project being benchmarked is linked with the MSVC static CRT you get a linker error since benchmark.lib is linked with the MSVC dynamic CRT (which is the default).

But no support needs to be added, passing -DCMAKE_CXX_FLAGS_RELEASE=/MT when building the benchmark library will link benchmark.lib with the static CRT.