patch 8.2.0506: Coverity complains about ignoring return value

Problem:    Coverity complains about ignoring return value.
Solution:   Add (void).
diff --git a/src/version.c b/src/version.c
index 447cf27..a53f44b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    506,
+/**/
     505,
 /**/
     504,