ignore the UTF-8 Byte Order Mark at the beginning of the input (via a file

given to execute, standard input (interactive or not), via -c command line
argument, or after “eval”, but not for $(…) comsubs, at the beginning of a
subsequent line, or within a line, etc.); regression test for it

idea during my “week off” (despite the pain), bsiegert@ thinks it's good –
and utf-8 capable tools ought to be able to do this anyway

main.c

@@ -13,7 +13,7 @@
 #include <locale.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/main.c,v 1.73 2007/03/04 03:04:26 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/main.c,v 1.74 2007/04/15 10:45:59 tg Exp $");
 
 extern char **environ;
 
@@ -457,6 +457,8 @@ shell(Source * volatile s, volatile int toplevel)
 	Source *volatile old_source = source;
 	int i;
 
+	s->flags |= SF_FIRST;	/* enable UTF-8 BOM check */
+
 	newenv(E_PARSE);
 	if (interactive)
 		really_exit = 0;