v4l2-library: libv4l: update mercurial tree to latest 0.3.1 release

From: Hans de Goede <j.w.r.degoede@hhs.nl>

This patch syncs (updates) the libv4l in mercurial with (to) the latest 0.3.1
release.
- Only serialize V4L2_BUF_TYPE_VIDEO_CAPTURE type ioctls
- Do not return an uninitialized variable as result code for GPICT
(fixes vlc, but see below)
- Add an apps-patches directory which includes:
 * vlc-0.8.6-libv4l1.patch, modify vlc's v4l1 plugin to directly call into
   libv4l1, in the end we want all apps todo this as its better then
   LD_PRELOAD tricks, but for vlc this is needed as vlc's plugin system
   causes LD_PRELOAD to not work on symbols in the plugins
 * camorama-0.19-fixes.patch, small bugfixes to camorama's v4l1 support,
   this patch only fixes _real_ bugs in camorama and does not change it to
   work with v4l1compat. Although it does work better with these bugs fixed
   :) With this patch and LD_PRELOAD=<path>/v4l1compat.so it works
   flawless.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Thierry MERLE <thierry.merle@free.fr>

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