Update CMakeLists.txt

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58716 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/CMakeLists.txt b/lib/Driver/CMakeLists.txt
index 0caa90c..cd4bffe 100644
--- a/lib/Driver/CMakeLists.txt
+++ b/lib/Driver/CMakeLists.txt
@@ -5,4 +5,5 @@
   InitHeaderSearch.cpp
   TextDiagnosticBuffer.cpp
   TextDiagnosticPrinter.cpp
+  PlistDiagnostics.cpp
   )