patch 8.1.0727: compiler warning for sprintf() argument

Problem:    Compiler warning for sprintf() argument.
Solution:   Add type cast.
diff --git a/src/version.c b/src/version.c
index c7d63f1..c0a2bb4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    727,
+/**/
     726,
 /**/
     725,