patch 8.1.0718: a couple compiler warnings

Problem:    A couple compiler warnings.
Solution:   Rename shadowed variables.  Add UNUSED.
diff --git a/src/version.c b/src/version.c
index 9d534c7..8344546 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    718,
+/**/
     717,
 /**/
     716,