mac frameworks use symlinks for their internal structure. This
reduces size of delivered framework folders by a factor of 3.

Also correctly clean the BGHUDAppkit ressources folder. Info.plist
must remain for proper code signing.

(cherry picked from commit 468c9ea3a6231ee63a0de40bda63e28f9b431a46)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>