Disable native-comp in agenda

It caused cryptic bugs in the past.

lisp/org-agenda.el

@@ -1,4 +1,4 @@
-;;; org-agenda.el --- Dynamic task and appointment lists for Org  -*- lexical-binding: t; -*-
+;;; org-agenda.el --- Dynamic task and appointment lists for Org  -*- lexical-binding: t; no-native-compile: t; -*-
 
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