use ADD_MAC_LIBRARY parameter to send framework to /Library/Frameworks

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
archive/unarchive tree

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
improved objc wrapper to detect if source is newer than object file

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
tried to fix compile error by adding derived sources

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>