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aux/getflags: fix named rune arguments.

Flags can be runes. That means that we can't just
look at p[1] to decide if we have a named argument,
we need to look one rune forward. This change
does that.

--- a/sys/src/cmd/aux/getflags.c

+++ b/sys/src/cmd/aux/getflags.c

@@ -76,6 +76,7 @@

 {

 	char *flags, *p, *s, *e, buf[512];

 	int i, n;

+	Rune r;

 	Fmt fmt;

 	doquote = needsrcquote;

@@ -92,14 +93,15 @@

 	fmtfdinit(&fmt, 1, buf, sizeof buf);

 	for(p=skipspace(flags); *p; p=nextarg(p)){

 		s = e = nil;

-		if(p[1] == ':'){

-			s = p + 2;

+		n = chartorune(&r, p);

+		if(p[n] == ':'){

+			s = p + n + 1;

 			e = argname(s);

 		}

 		if(s != e)

 			fmtprint(&fmt, "%.*s=()\n", (int)(e - s), s);

 		else

-			fmtprint(&fmt, "flag%.1s=()\n", p);

+			fmtprint(&fmt, "flag%C=()\n", r);

 	}

 	ARGBEGIN{

 	default: