New no return behaviour breaks dialog

[Dr. Werner Fink]

Hmmm ...

[   62s]                  from timebox.c:24:
[   62s] ./dialog.h: In function 'dlg_exit':
[   62s] ./dialog.h:866:1: error: '_Noreturn' in empty declaration
[   62s]   866 | extern void dlg_exit(int /*code*/) GCC_NORETURN;
[   62s]       | ^~~~~~
[   62s] In file included from ./dialog.h:78,
[   62s]                  from ./dlg_internals.h:27,
[   62s]                  from timebox.c:24:
[   62s] /usr/include/ncursesw/curses.h:75:22: warning: empty declaration
[   62s]    75 | #define GCC_NORETURN _Noreturn
[   62s]       |                      ^~~~~~~~~
[   62s] ./dialog.h:866:36: note: in expansion of macro 'GCC_NORETURN'
[   62s]   866 | extern void dlg_exit(int /*code*/) GCC_NORETURN;

That is ./ncurses-6.2/include/curses.h.in
and might be something like this ``__attribute__ ((noreturn));``
or requires including <sys/cdefs.h>

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