patch 9.0.0923: second SIGWINCH signal may be ignored

Problem:    Second SIGWINCH signal may be ignored.
Solution:   When set_shellsize() is busy when called then run the inner code
            again when it's done.  (issue #424)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    923,
 /**/
     922,
 /**/