patch 7.4.2139

Problem:    :delfunction causes illegal memory access.
Solution:   Correct logic when deciding to free a function.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2139,
 /**/
     2138,
 /**/