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ape/bsd/listen.c: Drop "bind 0".

There does not seem to be a good reason for this.  The "bind" command
has no practical consequence.

--- a/sys/src/ape/lib/bsd/listen.c

+++ b/sys/src/ape/lib/bsd/listen.c

@@ -139,12 +139,6 @@

 			errno = EBADF;

 			return -1;

 		}

-		/* FIXME: What is this good for? */

-		if(write(cfd, "bind 0", 6) < 0) {

-			errno = EGREG;

-			close(cfd);

-			return -1;

-		}

 		strcpy(msg, "announce ");

 		_sock_inaddr2string(r, msg + 9, sizeof msg - 9);

 		n = write(cfd, msg, strlen(msg));