patch 8.2.0506: Coverity complains about ignoring return value

Problem:    Coverity complains about ignoring return value.
Solution:   Add (void).

Author: brammool

src/userfunc.c

@@ -1321,7 +1321,7 @@ call_user_func(
 	// A Lambda always has the command "return {expr}".  It is much faster
 	// to evaluate {expr} directly.
 	++ex_nesting_level;
-	eval1(&p, rettv, TRUE);
+	(void)eval1(&p, rettv, TRUE);
 	--ex_nesting_level;
     }
     else

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    506,
 /**/
     505,
 /**/