make build with xorg-server 21.1.20, which now publishes some
new FOURCC_* defines that in some cases match but via different
methods, or conflict entirely (hi ati.)

various updates to build against xorg-server 21.1.3.

- avoid a const issue with an expanded __UNCONST().
- cope with renamed member names
- deal with "xf86RamDac.h" going away (now use "xf86Cursor.h")

fix merge botches.

re-add files autoconf files that the build sort of needs at
least configure for. command used:

% cd /usr/xsrc/external/mit/xf86-video-intel/dist
% autoreconf -I m4 -I /usr/xsrc/external/mit/xorg-server/dist -i

tested on sandy bridge and kaby lake.

merge xf86-video-intel 6afed33b2d673d88674f0c76efe500ae414e8e1b.

initial import of xf86-video-intel git version 6afed33b2d673d88674f0c76efe500ae414e8e1b

make the intel driver work again with xorg-server 1.20:

- BlockHandler() timeout value changed from struct timeval ** to int **
that has a millisecond value.

- avoid a NULL ptr deref in ProcXF86BigfontQueryFont() and make some
code actually able to be run.

fix various errors and warnings with xorg-server 1.20:

- no Error() in scope
- more wakeup/blockhandler ABI changes
- more notify fd API changes
- more xf86CursorResetCursor changes
- lots of char* -> const char*
- fix ati kms config.h now HAVE_XF86_CURSOR_RESET_CURSOR is available
- another xf86GetOS() is removed fix
- OsBlockSIGIO() etc, -> old, but still around API until properly converted
- don't free const char * data owned by some other system

mostly fix amd64 xorg-server 1.20 builds:

- avoid bswap_16 etc defines for now. ends up with code-in-decl
- more ABI_VERSION 23 fixes (BlockHandler/WakeHandler) including re-fix
from previous
- more Notify API
- more shadowUpdatePackedWeak() removal
- remove fd_set handling from intel driver (part of ABI_VERSION 23)
- cope better with PixMap/Drawable separation in new server
- remove support for maxHValue and maxVValue (XXX?)
- hide drmmode_udev_notify() when not building udev
- comment out nouveau 'wfb' support, xorg-server 1.20 only supplies
either 'wfb' or 'fb' interface, not both, and we choose 'fb'
- define 'pointer' in nv_proto.h rather than relying upon Xdefs.h
- normalise the value of _XTYPEDEF_POINTER
- EGL is broken (missing) in xsrc currently

various updates for xorg-server 1.20. some of these are work-in-progress,
the xsrc build is broken for most ports currently.

- xf86DisableRandR() is gone
- use HAVE_NOTIFY_FD like other modern drivers in compat-api.h
- pRotatedPixmap is done
- some PixmanPtr is now DrawablePtr (this one is all over problem with many
consumers, and perhaps the major breakage point currently.)

set mmap_arg.flags before calling DRM_IOCTL_I915_GEM_MMAP.

s/8/0x8/ and s/9/0x9/ to catch up with libdrm update.

Remove differences with upstream xf86-video-intel which are no longer
necessary. (Use do_ioctl and mmap rather than drmIoct and drmMap.)

http://mail-index.netbsd.org/tech-x11/2015/01/25/msg001486.html

apply upstream revision e143ce600af286ed9ad9d47afc22dbfbb66628dc to fix
building with x servers as ancient as ours

merge conflicts

initial import of xf86-video-intel-2.99.917

convert to drmMap. say hello to a visible cursor!

merge conflicts

Import the latest from x.org; no improvement over the current screen corruption.

Revert stop-gap in 1.2 now that Mesa is updated.

Disable DRI for Ivy Bridge (and later) until we update Mesa.

This is a stop-gap for PR 48916.

Use drmMap rather than mmap directly, to invoke the ioctl on NetBSD.

initial import of xf86-video-intel-2.21.15