to trigger AltiVec optimisations in our generic code.

 + contrib/src/Makefile: build more libs on BeOS, use libdts' svn
 + Makefile.am: fixed BeOS packages generation

* modules/video_output/directx/events.c: removed unused code.

 + extras/contrib/src/*: build libmpeg2 w/o mmxext and 3dnow on BeOS
   (buggy compiler)
 + modules/gui/beos/*: quick compile fixes
 + modules/video_filter/deinterlace.c: require mmxext instead of mmx
 + Makefile.am: on BeOS, build a VLC bundle a la OS X

* modules/video_output/x11/glx.c: OpenGL context is initialized in pf_init() because of threading issues.

* modules/video_output/opengl.c: new platform independant OpenGL vout (uses an "opengl provider" module).
* modules/visualization/galaktos/*: uses the new "opengl provider" module.

 don't have it

   simple interface to create and use OpenGL windows
 * modules/video_output/x11/glx.c: the GLX vout now implements the
  "opengl provider" interface
 * modules/visualization/galaktos/*: no more dependency on GLX: we use
   the generic opengl provider interface instead.

  Thanks to James MacLean, Arwed von Merkatz and Ross Finlayson for reporting and fixing the issue.

    the conversion ??)

    TODO: - factorization with xcommon.c
          - factorization with glx.c in GaLaktos plugin
          - remove hard-coded values
    (If you don't like the rotating cube, hack the code yourself,
    the variables will come later ! ;)

This makes the served stream work with cambozola applet.

    + Build-depend on libdvbpsi3-dev, so that we can get rid of the previous
      versions of this library.
    + Recommend the videolan-doc package.
    + Build-conflict on libavcodec-dev, just in case it enters Sid at an
      unappropriate moment.
  * debian/README.Debian:
    + Removed mention of the libmpeg2 tree, which we no longer provide.