[Nouveau] Bugfix + dri1 cleanup patches

[Emil Velikov]

Had those patches living in my local tree for a while now.
Here is a respin on top of latest master

Patch 1: regression fix,  preventing the ddx from loading if kernel
module is not loaded

Patches 2-5: Completely nuke dri1, make dri2 hard dependency

Patches 6-7: Assist people with first-time build of nouveau

Git complains about whitespace errors in patch 7, which for the sake
of me I cannot see

--

[PATCH 1/7] nouveau: Check if the device supports modesetting, after
opening it

[PATCH 2/7] nouveau: stop using dri1 function DRICreatePCIBusID
[PATCH 3/7] nouveau: Do not load dri {sub,}module
[PATCH 4/7] dri1: purge the final references
[PATCH 5/7] nouveau: mandate dri2 build

[PATCH 6/7] configure: require xorg-macros 1.8
[PATCH 7/7] configure: printout the configuration info

--

 configure.ac       | 33 ++++++++++++++++++++++++++++++++-
 src/nouveau_dri2.c | 16 ++--------------
 src/nv_driver.c    | 46 +++++++++++++++++-----------------------------
 src/nv_type.h      |  8 --------
 4 files changed, 51 insertions(+), 52 deletions(-)