remove Rune1 stuff; we've got 32-bit runes.  from sources.  thanks geoff.

Reference: /n/atom/patch/applied2013/filermrune1
Date: Fri Aug 23 05:20:02 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/file.c	Fri Aug 23 05:19:39 2013
+++ /sys/src/cmd/file.c	Fri Aug 23 05:19:41 2013
@@ -269,64 +269,10 @@
 	close(fd);
 }
 
-/*
- * Unicode 4.0 4-byte runes.
- */
-typedef int Rune1;
-
-enum {
-	UTFmax1 = 4,
-};
-
-int
-fullrune1(char *p, int n)
-{
-	int c;
-
-	if(n >= 1) {
-		c = *(uchar*)p;
-		if(c < 0x80)
-			return 1;
-		if(n >= 2 && c < 0xE0)
-			return 1;
-		if(n >= 3 && c < 0xF0)
-			return 1;
-		if(n >= 4)
-			return 1;
-	}
-	return 0;
-}
-
-int
-chartorune1(Rune1 *rune, char *str)
-{
-	int c, c1, c2, c3, n;
-	Rune r;
-
-	c = *(uchar*)str;
-	if(c < 0xF0){
-		r = 0;
-		n = chartorune(&r, str);
-		*rune = r;
-		return n;
-	}
-	c &= ~0xF0;
-	c1 = *(uchar*)(str+1) & ~0x80;
-	c2 = *(uchar*)(str+2) & ~0x80;
-	c3 = *(uchar*)(str+3) & ~0x80;
-	n = (c<<18) | (c1<<12) | (c2<<6) | c3;
-	if(n < 0x10000 || n > 0x10FFFF){
-		*rune = Runeerror;
-		return 1;
-	}
-	*rune = n;
-	return 4;
-}
-
 void
 filetype(int fd)
 {
-	Rune1 r;
+	Rune r;
 	int i, f, n;
 	char *p, *eob;
 
@@ -365,9 +311,9 @@
 		language[i].count = 0;
 	eob = (char *)buf+nbuf;
 	for(n = 0, p = (char *)buf; p < eob; n++) {
-		if (!fullrune1(p, eob-p) && eob-p < UTFmax1)
+		if (!fullrune(p, eob-p) && eob-p < UTFmax)
 			break;
-		p += chartorune1(&r, p);
+		p += chartorune(&r, p);
 		if (r == 0)
 			f = Cnull;
 		else if (r <= 0x7f) {