dix: Untwist transformAbsolute logic, eliminate uninitialized value warnings

tranformAbsolute has a pretty simple job, that of running the X/Y
values from a device through the transformation matrix. The tricky bit
comes when the current device state doesn't include one of the
values. In that case, the last delivered value is back-converted to
device space and used instead.

The logic was twisted though, confusing GCC's uninitialized value
detection logic and emitting warnings.

This has been fixed by changing the code to:

 1) Detect whether the ValuatorMask includes X/Y values
 2) If either are missing, back-convert the current values into ox/oy
 3) When X/Y are present, set ox/oy to the current value
 4) Transform
 5) Store X/Y values if changed or if they were set before.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
dri2: Distribute new pci_ids headers

Create hw/xfree86/dri2/pci_ids/Makefile.am which includes all of the new
pci id files in the tarballs. Build that from configure.ac, and run it
from dri2/Makefile.am

Signed-off-by: Keith Packard <keithp@keithp.com>
xfree86: Include 'drivers' directory with distribution

Even if we don't build it locally, make sure it gets included with the release.

Signed-off-by: Keith Packard <keithp@keithp.com>
Update to version 1.16.99.901

1.17 RC1

Signed-off-by: Keith Packard <keithp@keithp.com>