Remove a goofy CMake hack and use the standard CMake facilities to
express library-level dependencies within Clang.

This is no more verbose really, and plays nicer with the rest of the
CMake facilities. It should also have no change in functionality.

llvm-svn: 158888
diff --git a/clang/tools/c-index-test/CMakeLists.txt b/clang/tools/c-index-test/CMakeLists.txt
index c44b34b..743268c 100644
--- a/clang/tools/c-index-test/CMakeLists.txt
+++ b/clang/tools/c-index-test/CMakeLists.txt
@@ -1,5 +1,3 @@
-set(LLVM_USED_LIBS libclang)
-
 set( LLVM_LINK_COMPONENTS
   support
   mc
@@ -9,6 +7,10 @@
   c-index-test.c
   )
 
+target_link_libraries(c-index-test
+  libclang
+  )
+
 set_target_properties(c-index-test
   PROPERTIES
   LINKER_LANGUAGE CXX)