Makefile: Switch Clang Makefiles to always include the top-level Clang Makefile.
 - This eliminates most dependencies on how Clang is installed relative to LLVM.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@105637 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Makefile b/lib/Lex/Makefile
index bd3c7a8..9845214 100644
--- a/lib/Lex/Makefile
+++ b/lib/Lex/Makefile
@@ -11,8 +11,8 @@
 #
 ##===----------------------------------------------------------------------===##
 
-LEVEL = ../../../..
-include $(LEVEL)/Makefile.config
+CLANG_LEVEL := ../..
+include $(CLANG_LEVEL)/../../Makefile.config
 
 LIBRARYNAME := clangLex
 BUILD_ARCHIVE = 1
@@ -23,5 +23,5 @@
 
 CPP.Flags += -I$(PROJ_SRC_DIR)/../../include -I$(PROJ_OBJ_DIR)/../../include
 
-include $(LEVEL)/Makefile.common
+include $(CLANG_LEVEL)/Makefile