patch 8.2.0393: Coverity warns for not using return value

Problem:    Coverity warns for not using return value.
Solution:   Add (void).
diff --git a/src/version.c b/src/version.c
index fdd9d39..b0497a5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    393,
+/**/
     392,
 /**/
     391,