Fix handling of fatal signals and exceptions on MS-Windows.
src/w32proc.c (sys_signal): Handle all signals defined by the MS-Windows runtime, not just SIGCHLD. Actually install the signal handlers for signals supported by Windows. Don't override term_ntproc as the handler for SIGABRT. (sigaction): Rewrite to call sys_signal instead of duplicating its code. (sys_kill): Improve commentary. src/w32.c (term_ntproc): Accept (and ignore) one argument, for consistency with a signature of a signal handler. All callers changed. (init_ntproc): Accept an argument DUMPING. If dumping, don't install term_ntproc as a signal handler for SIGABRT, as that should be done by the dumped Emacs. src/w32.h (init_ntproc, term_ntproc): Adjust prototypes. src/w32select.c (term_w32select): Protect against repeated invocation by setting clipboard_owner to NULL after calling DestroyWindow. src/emacs.c (shut_down_emacs, main): Adapt the calls to init_ntproc and term_ntproc to their modified signatures.
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