patch 8.2.5031: cannot easily run the benchmarks

Problem:    Cannot easily run the benchmarks.
Solution:   Have "make benchmark" in the src directory work.
diff --git a/src/version.c b/src/version.c
index cc3542a..999cfde 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5031,
+/**/
     5030,
 /**/
     5029,