patch 8.2.0086: build error for small version

Problem:    Build error for small version. (Tony Mechelynck)
Solution:   Only use "user_data" with the +eval feature. Remove unused
            variable.

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    86,
 /**/
     85,
 /**/