[lit] Make config.llvm_lib_dir available on cmake, too.

The OCaml tests require config.llvm_lib_dir to determine
the OCaml package search path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224978 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Makefile b/test/Makefile
index 38aba65..7f253b0 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -123,7 +123,7 @@
 	@$(ECHOPATH) s=@LLVM_SOURCE_DIR@=$(LLVM_SRC_ROOT)=g >> lit.tmp
 	@$(ECHOPATH) s=@LLVM_BINARY_DIR@=$(LLVM_OBJ_ROOT)=g >> lit.tmp
 	@$(ECHOPATH) s=@LLVM_TOOLS_DIR@=$(ToolDir)=g >> lit.tmp
-	@$(ECHOPATH) s=@LIBDIR@=$(LibDir)=g >> lit.tmp
+	@$(ECHOPATH) s=@LLVM_LIBRARY_DIR@=$(LibDir)=g >> lit.tmp
 	@$(ECHOPATH) s=@SHLIBDIR@=$(SharedLibDir)=g >> lit.tmp
 	@$(ECHOPATH) s=@SHLIBEXT@=$(SHLIBEXT)=g >> lit.tmp
 	@$(ECHOPATH) s=@EXEEXT@=$(EXEEXT)=g >> lit.tmp