[CMake] llvm_add_library(MODULE) may use CMAKE_MODULE_LINKER_FLAGS instead of target property LINK_FLAGS.

I mis-dropped Darwin's link flags (in clang side) since r201073.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201317 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed