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.
diff --git a/src/version.c b/src/version.c
index 3ef0a9b..8bd7b8d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    918,
+/**/
     917,
 /**/
     916,