Keyworded ~ppc and ~ppc64, bug #524040

(Portage version: 2.2.8-r2/cvs/Linux x86_64, signed Manifest commit with key 0xF52D4BBA)
Keyword ~ppc64, bug #453782

(Portage version: 2.2.8-r2/cvs/Linux x86_64, signed Manifest commit with key 0xF52D4BBA)
Keyword ~ppc, bug #473154

(Portage version: 2.2.8-r2/cvs/Linux x86_64, signed Manifest commit with key 0xF52D4BBA)
Remove unused license, bug 523948.
Remove skype-4.0.0.7-third-party_attributions.txt from MISC-FREE license group, license has been removed, bug 523948.