patch 8.1.0744: compiler warnings for signed/unsigned strings

Problem:    Compiler warnings for signed/unsigned strings.
Solution:   A few more type cast fixes.
diff --git a/src/version.c b/src/version.c
index d40380c..69bbcfc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,7 +796,7 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
-    743,
+    744,
 /**/
     743,
 /**/