[w3m-dev 03758] Re: SVR4 signal behavior

* etc.c (reset_signals): use mySignal()
	(setup_child): ditto
	(myExec): ditto
	(mySignal): added, use sigaction if available
* fm.h (TRAP_ON): use mySignal
	(TRAP_OFF): ditto
* istream.c (ISclose): ditto
* main.c (sig_chld): ditto
	(main): ditto
	(do_dump): ditto
	(resize_hook): ditto
	(resize_handler): ditto
	(srchcore): ditto
	(readsh): ditto
	(SigAlarm): ditto
* proto.h (mySignal): added
* terms.c (error_dump): use mySignal()
	(set_int): ditto
	(mouse_init): ditto
From: Atsushi YOKOYAMA <yoko-a@cmh.fuchu.toshiba.co.jp>

proto.h

@@ -1,4 +1,4 @@
-/* $Id: proto.h,v 1.90 2003/02/06 17:21:44 ukai Exp $ */
+/* $Id: proto.h,v 1.91 2003/02/18 15:43:25 ukai Exp $ */
 /* 
  *   This file was automatically generated by version 1.7 of cextract.
  *   Manual editing not recommended.
@@ -610,6 +610,7 @@ extern char *url_unquote_conv(char *url, char code);
 extern char *expandName(char *name);
 extern Str tmpfname(int type, char *ext);
 extern time_t mymktime(char *timestr);
+extern void (*mySignal(int signal_number, void (*action)(int)))(int);
 #ifdef USE_COOKIE
 extern char *FQDN(char *host);
 extern Str find_cookie(ParsedURL *pu);