[lld][coff] Add missing dependency to fix build.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@375238 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/COFF/CMakeLists.txt b/COFF/CMakeLists.txt
index da2916f..a30df7c 100644
--- a/COFF/CMakeLists.txt
+++ b/COFF/CMakeLists.txt
@@ -28,6 +28,7 @@
   BinaryFormat
   Core
   DebugInfoCodeView
+  DebugInfoDWARF
   DebugInfoMSF
   DebugInfoPDB
   Demangle