CMake: don't try to link with librt on MinGW #3546
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On MinGW, librt will might will found as rt library in MSYS, but fails linking with "cannot find -lrt" error. As librt is not avaiable on native Windows, we should never try to link with -lrt on MinGW (which is native Windows).
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On MinGW, librt might be found as rt library in MSYS (not MinGW), but this fails linking with "cannot find -lrt" error.
As librt is not avaiable on native Windows, we should never try to link with -lrt on MinGW (which is native Windows).