Attributes GH PR #8: https://github.com/ArcticaProject/nx-libs/pull/8

Cherry-picked from branch 3.5.0.x.

Cherry-picked from branch 3.5.0.x.

Cherry-picked from branch 3.5.0.x.

This is basically a merge of the most current xorg-server (1.17.1) code
into nx-X11.

It makes sure that for source pictures, which do not have a drawable
surface, a filter is selected that is supported on the "main" and all
other screens.  Alternatively, if the requested filter is not available
on all screens and the picture is a source picture, this function fails
gracefully.

Additionally, the ChangePictureFilter hook is now called for non-source
pictures.

This also needs an implementation in mipict.{c,h}. The default hook does
nothing and returns a success value.

nxcomp{,ext,shad}: only use the first three numbers in the full version for current_version on OS X. ld(1) on 10.6 fails otherwise.

Cherry-picked from branch 3.5.0.x.

Cherry-picked from branch 3.5.0.x.

Conflicts:
  debian/changelog

nxcomp{,ext,shad}: use the correct library naming scheme on OS X. It differs from other UNIX-based systems.

library clean-up: Don't build libNX_Xpm anymore. Use system's libXpm shared library.

 One release goal for version 3.6.x of nx-libs is dropping as many bundled libraries as possible that haven't 
 been adapted to nx-libs.

 Starting with libNX_Xpm here.

 The libNX_Xpm library is only referenced once (nx-X11/programs/Xserver/hw/nxagent/Holder.c).
 When grepping through Xserver/hw/nxagent the suspicion comes up, that the libXpm linkage is not
 needed at all, because none of the provided functions are used inside the nxagent Xserver.

Ensure that the given strings length in an XkbSetGeometry request remain
within the limits of the size of the request.

v3: backport to nx-libs 3.6.x because this is
the CVE-2015-0255 fix (Mike DePaulo)
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 20079c36cf7d377938ca5478447d8b9045cb7d43)
(cherry picked from commit f160e722672dbb2b5215870b47bcc51461d96ff1)
Signed-off-by: Julien Cristau <jcristau@debian.org>