remove vestigial donation code

Reference: /n/atom/patch/applied/nodonate
Date: Wed Jun  4 17:47:52 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/port/devcons.c	Wed Jun  4 17:47:47 2014
+++ /sys/src/nix/port/devcons.c	Wed Jun  4 17:47:48 2014
@@ -417,7 +417,7 @@
 	synccons();
 
 	splhi();	/* never to release */
-	p = seprint(buf, buf+sizeof buf, "panic: cpu%d: ", m->machno);
+	p = seprint(buf, buf+sizeof buf, "panic: mach%d: ", m->machno);
 	va_start(arg, fmt);
 	vseprint(p, buf+sizeof(buf), fmt, arg);
 	va_end(arg);
@@ -825,7 +825,7 @@
 	char *b, *bp, ch, *s, *e, tmp[512];
 	int i, k, id, send;
 	long offset;
-	extern int schedsteals, scheddonates;
+	extern int schedsteals;
 
 	if(n <= 0)
 		return n;
@@ -1033,7 +1033,6 @@
 	case Qdebug:
 		e = tmp + sizeof tmp;
 		s = seprint(tmp, e, "steal %d\n", schedsteals);
-		s = seprint(s, e, "donate %d\n", scheddonates);
 		s = seprint(s, e, "locks %llud\n", lockstats.locks);
 		s = seprint(s, e, "glare %llud\n", lockstats.glare);
 		s = seprint(s, e, "inglare %llud\n", lockstats.inglare);
@@ -1060,7 +1059,7 @@
 	ulong offset;
 	Cmdbuf *cb;
 	Cmdtab *ct;
-	extern int schedsteals, scheddonates;
+	extern int schedsteals;
 	a = va;
 	offset = off;
 
@@ -1192,10 +1191,6 @@
 			schedsteals = 1;
 		else if(strcmp(buf, "nosteal") == 0)
 			schedsteals = 0;
-		else if(strcmp(buf, "donate") == 0)
-			scheddonates = 1;
-		else if(strcmp(buf, "nodonate") == 0)
-			scheddonates = 0;
 		else
 			error(Ebadctl);
 		break;