Menu bar broken on MS-DOS

[Eli Zaretskii]

The MS-DOS build comes up without a menu bar in the initial frame (and
in every frame created thereafter), although the value of
menu-bar-mode is t.  Toggling menu-bar-mode twice restores the menu
bar.

I think this is due to the changes in revno 100650:

    2010-06-27  Chong Yidong  <address@hidden>

            * startup.el (command-line): Use X resources to set the value of
            menu-bar-mode and tool-bar-mode, before calling frame-initialize.

            * menu-bar.el (menu-bar-mode):
            * tool-bar.el (tool-bar-mode): Don't change default-frame-alist.
            Set init-value to t.

            * frame.el (frame-notice-user-settings): Don't change
            default-frame-alist based on menu-bar-mode and tool-bar-mode, or
            vice versa (Bug#2249).

Before that change, startup.el called `(menu-bar-mode 1)', but now it
doesn't.  I cannot see where this call is made now.  Can you please
describe how does this work on X?  I will then see how to make the DOS
build work similarly to X and w32.