patch 8.1.0067: syntax highlighting not working when re-entering a buffer

Problem:    Syntax highlighting not working when re-entering a buffer.
Solution:   Do force executing autocommands when not called recursively.
diff --git a/src/version.c b/src/version.c
index d3c7316..0ecc60c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    67,
+/**/
     66,
 /**/
     65,