patch 7.4.1977

Problem:    With 64 bit changes don't need three calls to sprintf().
Solution:   Simplify the code, use vim_snprintf(). (Ken Takata)

src/version.c

@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1977,
 /**/
     1976,
 /**/