IPv6 URL patch (against 1.2.10)

Greets.  This is rather simple, and allows IPv6 HTTP URLs to work with MP3 
streams within XMMS, such as:

http://[2001:470:1f00:488:2::1]:8000/blah.mp3

or even:

http://[2001:470:1f00:488:ffff::24.87.188.41]/foo.mp3 (nested IPv4, for 
IPv4-over-IPv6, 4o6)

This has been a significantly painful thorn in my side for a little while, so 
I decided to take matters into my own hands and contribute in back.

I hope it meets your approval.

(I'm not subscribed to the list, please E-Mail me directly if you wish to 
carry correspondence)

Regards,
-- Daniel