patch 8.2.3811: the opfunc error test fails on a slow machine

Problem:    The opfunc error test fails on a slow machine.
Solution:   Use WaitForAssert().
diff --git a/src/version.c b/src/version.c
index 6ce7173..581fcd7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3811,
+/**/
     3810,
 /**/
     3809,