Use the same mp_input_add_key_fd for all uses and add a context
argument to its callback that was before only in the event fd
callbacks. Instead of checking in input.c whether keys were inserted
to the keypress FIFO during the callback do the check in the callback
before returning and set return value accordingly.
patch by Zoltan Ponekker, pontscho kac.poliod hu
cleaned up by Ulion, ulion2002 gmail com with some help by Reimar and me
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24057 b3059339-0415-0410-9bf9-f77b7e298cf2
