[compiler-rt] [compiler-rt] Reinstate removal of CRT choice flags from CMAKE_*_FLAGS* (PR #67935)

[Alexander Neumann via llvm-commits]

================
@@ -375,6 +375,25 @@ endif()
 if(MSVC)
   # FIXME: In fact, sanitizers should support both /MT and /MD, see PR20214.
   set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)
----------------
Neumann-A wrote:

Let me ask a stupid question: Why is this even set? The VS sanitizers come in all flavors and are basically derived from llvm as far as I know

https://github.com/llvm/llvm-project/pull/67935