bug#74968: 31.0.50; PGTK - Build failure on Master

[German Pacenza]

Non PGTK build also fails:

  CC       xterm.o
In file included from ../../emacs/src/term.c:30:
../../emacs/src/term.c: In function ‘Ftty_frame_restack’:
../../emacs/src/term.c:4857:29: warning: function might be candidate for 
attribute ‘noreturn’ [-Wsuggest-attribute=noreturn]
 4857 | DEFUN ("tty-frame-restack", Ftty_frame_restack,
      |                             ^~~~~~~~~~~~~~~~~~
../../emacs/src/lisp.h:3490:16: note: in definition of macro ‘DEFUN’
 3490 |    Lisp_Object fnname
      |                ^~~~~~
  CC       xfns.o
  CC       xselect.o
../../emacs/src/xterm.c: In function ‘x_cr_export_frames’:
../../emacs/src/xterm.c:6372:13: error: ‘Qredisplay_dont_pause’ 
undeclared (first use in this function)
 6372 |   specbind (Qredisplay_dont_pause, Qt);
      |             ^~~~~~~~~~~~~~~~~~~~~
../../emacs/src/xterm.c:6372:13: note: each undeclared identifier is 
reported only once for each function it appears in
../../emacs/src/xfns.c: In function ‘Fx_print_frames_dialog’:
../../emacs/src/xfns.c:9967:13: error: ‘Qredisplay_dont_pause’ 
undeclared (first use in this function)
 9967 |   specbind (Qredisplay_dont_pause, Qt);
      |             ^~~~~~~~~~~~~~~~~~~~~
../../emacs/src/xfns.c:9967:13: note: each undeclared identifier is 
reported only once for each function it appears in
make[3]: *** [Makefile:457: xfns.o] Error 1