patch 8.2.4937: no test for what 8.2.4931 fixes

Problem:    No test for what 8.2.4931 fixes.
Solution:   Add a test that triggers a valgrind error.
diff --git a/src/version.c b/src/version.c
index 7c49116..8cc9ceb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4937,
+/**/
     4936,
 /**/
     4935,