[CMake] Deprecate CLANG_RUNTIME_OUTPUT_INTDIR and CLANG_LIBRARY_OUTPUT_INTDIR.

LLVM_*_OUTPUT_INTDIR should be available everywhere. It was my mistake when I introduced INTDIR stuff.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@199597 91177308-0d34-0410-b5e6-96231b3b80d8