(refs #1672, 5dca2e33)

The only way to test it for now is to use the following syntax:
avio://full_url
like for example avio://http://myhost/myfile.avi
It cannot be instanciated multiple times per process.

(This is untested as my current hardware driver only has GLX 1.2)

X11 extensions are upward compatible only if they have the same major
version number. In other words, we wouldn't support XVideo >= 3.0.

This requires libx11-xcb, since the higher layers of GLX are not
available for pure X11 C Bindings currently.

TBD: resizing and GLX 1.3

Handle caching and fix race conditions

It was already used in the code...

This saves some precious memory if we don't browse them.

Recents items from 1 to 9 are supported to Ctrl+1 to Ctrl+9

The height is one pixel less. I am not sure we can improve that a lot now.

This patch fixes failed assertions occurring sometimes on var_DelCallback for intf-event for input objects.

Also, let the possibility to run vlc -H.

Pointed-out-by Rémi Denis-Courmont <remi@remlab.net>.

This saves 16MB minus 16kB of live memory during audio stream playback on Mac OS X.

macosx/framework: Don't attempt to do anything at exit or at construction this is nasty for a Framework.