c-index-test Makefile: fix build on Linux.  Reviewed by Eric Christopher.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161439 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/c-index-test/Makefile b/tools/c-index-test/Makefile
index 25478e1..eb4d7de 100644
--- a/tools/c-index-test/Makefile
+++ b/tools/c-index-test/Makefile
@@ -29,5 +29,5 @@
 
 include $(CLANG_LEVEL)/Makefile
 
-LIBS += "$(LIBXML2_LIBS)"
-CPPFLAGS += "$(LIBXML2_INC)"
+LIBS += $(LIBXML2_LIBS)
+CPPFLAGS += $(LIBXML2_INC)