[c-index-test] When building with BUILD_CLANG_ONLY=YES, include c-index-test.

It is part of libclang and has other uses besides running the clang tests.

llvm-svn: 167478

clang/tools/Makefile

@@ -18,7 +18,7 @@ DIRS := driver libclang c-index-test arcmt-test c-arcmt-test diagtool \
 OPTIONAL_DIRS := extra
 
 ifeq ($(BUILD_CLANG_ONLY),YES)
-  DIRS := driver libclang
+  DIRS := driver libclang c-index-test
   OPTIONAL_DIRS :=
 endif