Remove stray leftover dep management code

Author: rnk

clang/unittests/Index/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(LLVM_LINK_COMPONENTS
-  )
-
 add_clang_unittest(IndexTests
   IndexTests.cpp
   CLANG_LIBS
@@ -15,7 +12,3 @@ add_clang_unittest(IndexTests
   ${LLVM_TARGETS_TO_BUILD}
   Support
   )
-
-clang_target_link_libraries(IndexTests
-  PRIVATE
-  )