some smaller updates

Hi,

I've made some smaller changes to your live ebuild. Please have a look at it :)

* multilib version's of soxr and jack shouldn't be needed. I've tested this and it did compile/work fine.
* some smaller changes to your multilib_src_configure()
* multilib_src_install was removed, there is nothing special todo in here so it's not needed

Small suggestion:
What about creating an patch for removing bundled soxr? This isn't something really important, just though it would make the ebuild a bit lighter :)

Regards,
Michael