patch 8.2.0918: duplicate code for evaluating expression argument

Problem:    Duplicate code for evaluating expression argument.
Solution:   Merge the code and make the use more flexible.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    918,
 /**/
     917,
 /**/