patch 8.1.1641: garbage collection may run at a wrong moment

Problem:    Garbage collection may run at a wrong moment. (Trygve Aaberge)
Solution:   Postpone garbage collection while parsing messages. (closes #4620)
diff --git a/src/version.c b/src/version.c
index 85cf7b2..663f92f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1641,
+/**/
     1640,
 /**/
     1639,