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)
diff --git a/src/version.c b/src/version.c
index d4edf67..c44d2f1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    173,
+/**/
     172,
 /**/
     171,