(vga_installed): New function, code moved from

(vga_installed): New function, code moved from
dos_set_window_size.
(Qbar, Qcursor_type, outside_cursor): New variables.
(syms_of_msdos): Intern and staticpro them.
(dos_ttraw) [__DJGPP__ >= 2, !HAVE_X_WINDOWS]: Save the cursor
shape used outside Emacs when called for the first time.
(dos_ttcooked) [__DJGPP__ >= 2, !HAVE_X_WINDOWS]: Restore the
cursor shape used outside Emacs.
(msdos_set_cursor_shape, IT_set_cursor_type): New functions.
(IT_frame_up_to_date): Call IT_set_cursor_type, in case the cursor
type has changed.
(IT_set_frame_parameters): Call IT_set_cursor_type if the frame
parameters specify the cursor.  Make qreverse a global
variable (renamed to Qreverse).