mk mk debugging output plumbable by using file:lineno not
file[lineno]

Reference: /n/sources/patch/applied/mkdbgplumb
Date: Mon Dec 17 03:42:40 CET 2007
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/mk/rule.c	Mon Dec 17 03:41:35 2007
+++ /sys/src/cmd/mk/rule.c	Mon Dec 17 03:41:33 2007
@@ -75,7 +75,7 @@
 {
 	Bprint(&bout, "%s: start=%p\n", s, r);
 	for(; r; r = r->next){
-		Bprint(&bout, "\tRule %p: %s[%d] attr=%x next=%p chain=%p alltarget='%s'",
+		Bprint(&bout, "\tRule %p: %s:%d attr=%x next=%p chain=%p alltarget='%s'",
 			r, r->file, r->line, r->attr, r->next, r->chain, wtos(r->alltargets, ' '));
 		if(r->prog)
 			Bprint(&bout, " prog='%s'", r->prog);