patch 7.4.1773

Problem:    Compiler warnings. (Dominique Pelle)
Solution:   Add UNUSED. Add type cast. Avoid a buffer overflow.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1773,
 /**/
     1772,
 /**/