Revert "[CMake] Unify llvm_check_linker_flag and llvm_check_compiler_linker_flag"

libc++ clang-cl tests failed after that commit

Look at https://buildkite.com/llvm-project/libcxx-ci/builds/20490

Reviewed By: #libc

Differential Revision: https://reviews.llvm.org/D145858

This reverts commit b00aaab7.