patch 7.4.1868

Problem:    Setting really_exiting causes memory leaks to be reported.
Solution:   Add the in_free_all_mem flag.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1868,
 /**/
     1867,
 /**/