* ./include/modules_inner.h: replaced _X with __VLC_SYMBOL because _X was
    already a system macro under MacOS X.
  * ./plugins/dummy/dummy.c: fixed vlc:loop, vlc:quit, etc. entries.
  * ./plugins/glide/glide.c: activated double buffering.
  * ./plugins/mga/xmga.c: started writing an xmga plugin; doesn't work yet.
  * ./src/input/input.c: fixed the input memory leak, and the insane thread
    spawning we got with vlc:loop.
  * ./src/misc/intf_eject.c: disc ejection routine courtesy of Julien Blache,
    currently Linux-only.