Banshee profile: Revert back to not building webkit-gtk on OS X
Banshee profile: Revert back to not building webkit-gtk on OS X

This is apparently impossible and additionally our current .NET
bindings are targeting an API which has been removed upstream.

See:
http://www.google-melange.com/gsoc/proposal/review/org/google/gsoc2015/k
nocte/5668600916475904#c5741031244955648

BansheeMediaPlayer/bockbuild,BansheeMediaPlayer/bockbuild,BansheeMediaPlayer/bockbuild