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add OSX recvfrom, fix UDP announce (thanks Int21h)

system call to libsys for OS X and also made a minor
edit to announcesock so it would work with UDP.

--- a/lib/std/listen+posixy.myr

+++ b/lib/std/listen+posixy.myr

@@ -91,8 +91,10 @@

 	if sys.bind(sock, sa, sz) < 0

 		-> `Err "failed to bind socket"

 	;;

-	if sys.listen((sock : sys.fd), 10) < 0

-		-> `Err "unable to listen on socket"

+	if proto == sys.Sockstream

+		if sys.listen((sock : sys.fd), 10) < 0

+			-> `Err "unable to listen on socket"

+		;;

 	;;

 	-> `Ok mk([.lfd=(sock : fd)])

 }

--- a/lib/sys/sys+osx-x64.myr

+++ b/lib/sys/sys+osx-x64.myr

@@ -813,6 +813,7 @@

 	const bind	: (sock : fd, addr : sockaddr#, len : size -> int)

 	const setsockopt	: (sock : fd, lev : sockproto, opt : sockopt, val : void#, len : size -> int)

 	const getsockopt	: (sock : fd, lev : sockproto, opt : sockopt, val : void#, len : size# -> int)

+	const recvfrom	: (sock : fd, buf : byte[:], flags : int, addr : sockaddr#, addr_len : size# -> int)

 	/* memory mapping */

 	const munmap	: (addr:byte#, len:size -> int64)

@@ -1005,6 +1006,7 @@

 const bind	= {sock, addr, len;	-> (syscall(Sysbind, a(sock), a(addr), a(len)) : int)}

 const setsockopt	= {sock, lev, opt, val, len;	-> (syscall(Syssetsockopt, a(sock), a(lev), a(opt), a(val), a(len)) : int)}

 const getsockopt	= {sock, lev, opt, val, len;	-> (syscall(Syssetsockopt, a(sock), a(lev), a(opt), a(val), a(len)) : int)}

+const recvfrom	= {sock, buf, flags, addr, addr_len;	-> (syscall(Sysrecvfrom, a(sock), (buf : byte#), a(buf.len), a(flags), a(addr), a(addr_len)) : int)}

 /* memory management */

 const munmap	= {addr, len;		-> syscall(Sysmunmap, a(addr), a(len))}