updated for version 7.3.1221

Problem:    When build flags change "make distclean" run into a configure
            error.
Solution:   When CFLAGS changes delete auto/config.cache.  Also avoid adding
            duplicate text to flags.

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1221,
 /**/
     1220,
 /**/