patch 8.0.0969: Coverity warning for unused return value

Problem:    Coverity warning for unused return value.
Solution:   Add (void) to avoid the warning.
diff --git a/src/version.c b/src/version.c
index 2f90127..c1260ec 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    969,
+/**/
     968,
 /**/
     967,