Pull Request:
https://github.com/rpmfusion/mixxx/pull/1

The individual commits in this branch can be viewed as a changelog:
- Update (remove/add) the build requirements for the upcoming release 2.1
- Modify the build options to result in an almost feature complete executable
and plugins with portable optimizations enabled

2 Remarks:
- I noticed that Mixxx is currently part of the free repository, although with
inclusion of the FAAD2 plugin it should actually be placed in the nonfree
repository?
- We already pulled the included patch into our current 2.1 release branch.
This can be removed when upgrading to the latest snapshot.