shairport: Update shairport to final version 1.0

shairport: Update shairport to final version 1.0

James Laird (abrasive), together with some other developers, has updated
shairport fixing several bugs and adding several improvements.
https://github.com/abrasive/shairport/tree/master

This patch changes the package source to his repo and deletes the unneeded IPv6
patch.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>
[florian: fix subject and reformat commit message]
Signed-off-by: Florian Fainelli <[email protected]>
SVN-Revision: 40720