'temacs -nw' should not call missing functions

'temacs -nw' should not call missing functions

Without this patch, "temacs -nw" fails with the diagnostic
"emacs: Symbol's function definition is void: frame-windows-min-size"
and messes up the tty's state.
* lib-src/make-docfile.c (write_globals):
Declare Fframe_windows_min_size with ATTRIBUTE_CONST, too.  Sort.
* src/frame.c (Fframe_windows_min_size): New placeholder function.
(syms_of_frame): Define it.
* src/window.c (Fwindow__sanitize_window_sizes): New placeholder.
(syms_of_window): Define it.