allow subfonts to specify Runes up to and including Runemax
instead of 65535

Reference: /n/sources/patch/saved/bloated-rune-libdraw
Date: Fri Jan 29 07:06:26 CET 2010
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libdraw/buildfont.c	Fri Jan 29 07:05:28 2010
+++ /sys/src/libdraw/buildfont.c	Fri Jan 29 07:05:27 2010
@@ -70,7 +70,7 @@
 		}
 		max = strtol(s, &s, 0);
 		s = skip(s);
-		if(*s==0 || min>=65536 || max>=65536 || min>max){
+		if(*s==0 || min>Runemax || max>Runemax || min>max){
 			werrstr("illegal subfont range");
     Err3:
 			freefont(fnt);