updated for version 7.3.173

Problem:    After using setqflist() to make the quickfix list empty ":cwindow"
            may open the window anyway.  Also after ":vimgrep".
Solution:   Correctly check whether the list is empty. (Ingo Karkat)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    173,
 /**/
     172,
 /**/