updated for version 7.3.1256

Problem:    Can't build without eval or autocmd feature.
Solution:   Add #ifdefs.

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1256,
 /**/
     1255,
 /**/