[xbmc] Updated meta file for xbmc in package mediacenter, to my version of FernetMenta/xbmc (beppec56/xbmc:frodo-beppe_oe-4b155d0).
[xbmc] Removed patch clashing with FernetMenta's Frodo version.
Revert "[xbmc] Disable external ffmpeg library. Enable the xbmc one."

This reverts commit d76d4398f689f0bf1eba4f77858e686514827a94.
[xbmc] Forced addons url link (testing...).