Adding the Alure package

Im terribly sorry for I'm am not used to using github merge request feature. I had manually rebased and squashed my commits as it was my own history but this didn't work well with my previous pull request. In the future I'll refrain from doing so.

So yet again Alure is a package that allows for loading more types of audio files in OpenAL buffers. As it is Alure's task to extend OpenAL I let it depend on all audio packages in MXE that alure can handle.

I moved the VERBOSE=1 to the back of the make line.
I also made it an out of source build instead of an in-source one.

I looked at the PKG_CONFIG_EXECUTABLE that should have been set by the cmake toolchain file, but had no luck finding the issue. It seems the value is overridden by the CMakeLIsts. But i find no related SET with the CACHE and FORCE flags to justify that. It might be a bug in the FindPkgConfig.cmake (that gets included) or something in reading the toolchain file. But this is pure speculation.