test/Makefile: Inspect $(PROJ_OBJ_ROOT)/tools/clang/Makefile instead of $(PROJ_SRC_ROOT)/tools/clang for "check-all".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142100 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed