[libcxx] Respect CMAKE_MSVC_RUNTIME_LIBRARY wrt whether to use the debug CRT
If CMAKE_MSVC_RUNTIME_LIBRARY isn't set, then CMake defaults to
the debug CRT, if CMAKE_BUILD_TYPE is set to Debug. If
CMAKE_MSVC_RUNTIME_LIBRARY is set though, that overrides any
implicit defaults.
Match this in libcxx's own manual linking logic. This allows
decoupling the debug CRT from the CMAKE_BUILD_TYPE and allows users
to configure their builds exactly how they want.
Differential Revision: https://reviews.llvm.org/D155561
GitOrigin-RevId: 9b02e8d4a0abd60ae1a825e4192fc4ea67ba9049
2 files changed
