gallium/auxiliary: add contained and rect checks (v5)

v3: thanks to Brian, improved coding style, also glennk helped spot few
things (unsigned -> int, two constify)
v4: thanks Ilia improved function, dropped u_box_clip_3d
v5: incorporated rest of Gregor proposed changes

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
nine: Add state tracker nine for Direct3D9 (v3)

Work of Joakim Sindholt (zhasha) and Christoph Bumiller (chrisbmr).
DRI3 port done by Axel Davy (mannerov).

v2: - nine_debug.c: klass extended from 32 chars to 96 (for sure) by glennk
    - Nine improvements by Axel Davy (which also fixed some wine tests)
    - by Emil Velikov:
     - convert to static/shared drivers
     - Sort and cleanup the includes
     - Use AM_CPPFLAGS for the defines
     - Add the linker garbage collector
     - Restrict the exported symbols (think llvm)

v3: - small nine fixes
    - build system improvements by Emil Velikov

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Reviewed-by: Axel Davy <axel.davy at ens.fr>
Signed-off-by: David Heidelberg <david@ixit.cz>
nine: Add drirc options (v2)

Implements vblank_mode and throttling, which  allows us change default ratio
between framerate and input lag.

Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Axel Davy <axel.davy@ens.fr>
nine: Implement threadpool

DRI_PRIME setups have different issues due the lack of dma-buf fences
support in the drivers. For DRI3 DRI_PRIME, a race can appear, making
tearings visible, or worse showing older content than expected. Until
dma-buf fences are well supported (and by all drivers), an alternative
is to send the buffers to the server only when rendering has finished.
Since waiting the rendering has finished in the main thread has a
performance impact, this patch uses an additional thread to offload the
wait and the sending of the buffers to the server.

Reviewed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Axel Davy <axel.davy@ens.fr>