patch 8.1.0868: crash if triggering garbage collector after a function call

Problem:    Crash if triggering garbage collector after a function call.
            (Michael Henry)
Solution:   Don't call the garbage collector right away, do it later.
            (closes #3894)
diff --git a/src/version.c b/src/version.c
index 92e9805..1a2e2be 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    868,
+/**/
     867,
 /**/
     866,