Add new doom|mark-buffer-as-real hook to term/eshell

This is simpler (and perhaps faster) than doom-real-buffer-functions.
Better to reserve that for more complex logic.

core/autoload/buffers.el

@@ -174,6 +174,16 @@ regex PATTERN. Returns the number of killed buffers."
       (kill-buffer buf))))
 
 
+;;
+;; Hooks
+;;
+
+;;;###autoload
+(defun doom|mark-buffer-as-real ()
+  "Hook function that marks the current buffer as real."
+  (doom-set-buffer-real (current-buffer) t))
+
+
 ;;
 ;; Interactive commands
 ;;