Remove workarounds for unsupported MSVC versions

googlemock/include/gmock/gmock-matchers.h

googlemock/include/gmock/internal/gmock-port.h

googlemock/src/gmock-spec-builders.cc

googlemock/test/gmock-actions_test.cc

googlemock/test/gmock-generated-function-mockers_test.cc

googletest/cmake/internal_utils.cmake

googletest/include/gtest/internal/gtest-internal.h

googletest/include/gtest/internal/gtest-port.h

googletest/src/gtest.cc