patch 7.4.2330

Problem:    Coverity complains about not checking curwin to be NULL.
Solution:   Use firstwin to avoid the warning.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2330,
 /**/
     2329,
 /**/