Add clang_site_config user variable, so that extra tests (e.g., utils/C++Syntax)
can always find the main clang site config (when invoked via CMake/Makefiles, at
least).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86139 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed