updated for version 7.3.921

Problem:    Trying to create a fontset handle when 'guifontset' is not set.
Solution:   Add curly braces around the code block. (Max Kirillov)

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    921,
 /**/
     920,
 /**/