change a few renameFile's to rename

AFAIK, none of these ever operate on directories, but nor do I want to
explicitly check if they're files and fail if not.

Utility/Daemon.hs

@@ -77,7 +77,7 @@ lockPidFile file = do
 #else
 	writeFile newfile "-1"
 #endif
-	renameFile newfile file
+	rename newfile file
   where
 	newfile = file ++ ".new"