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libc: allow announce address of the form #I1/tcp!*!564

we allow protocol path to begin with # for dial, so should
allow this for announce as well. this is primarily usefull
when booting the fileserver to listen on alternate ip stack.

--- a/sys/src/libc/9sys/announce.c

+++ b/sys/src/libc/9sys/announce.c

@@ -218,11 +218,11 @@

 		werrstr("bad dial string: %s", addr);

 		return -1;

 	}

-	if(*addr != '/'){

+	if(*addr != '/' && *addr != '#'){

 		strncpy(netdir, "/net", sizeof(netdir));

 		netdir[sizeof(netdir) - 1] = 0;

 	} else {

-		for(p2 = p; *p2 != '/'; p2--)

+		for(p2 = p; p2 > addr && *p2 != '/'; p2--)

 			;

 		i = p2 - addr;

 		if(i == 0 || i >= sizeof(netdir)){