Fix another bot failure from r329951.

llvm-svn: 329986
diff --git a/llvm/unittests/Demangle/CMakeLists.txt b/llvm/unittests/Demangle/CMakeLists.txt
index 4bf3a4b..4bf3699 100644
--- a/llvm/unittests/Demangle/CMakeLists.txt
+++ b/llvm/unittests/Demangle/CMakeLists.txt
@@ -1,3 +1,7 @@
+set(LLVM_LINK_COMPONENTS
+  Demangle
+)
+
 set(DemangleSources
   PartialDemangleTest.cpp
 )