Extend a workaround for a CMake bug in LLVM's r159593 to apply to
a Clang target which hits the same bug directly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159598 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 272e124..8184c3d 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -88,5 +88,6 @@
 endif()
 
 # Add a legacy target spelling: clang-test
-add_custom_target(clang-test DEPENDS check-clang)
+add_custom_target(clang-test)
+add_dependencies(clang-test check-clang)
 set_target_properties(clang-test PROPERTIES FOLDER "Clang tests")