patch 8.1.1367: can set 'modelineexpr' in modeline

Problem:    can set 'modelineexpr' in modeline.
Solution:   Add P_SECURE flag.
diff --git a/src/version.c b/src/version.c
index bcc9aef..7c548bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1367,
+/**/
     1366,
 /**/
     1365,