Support the wheel tilt axis source

Available since libinput 1.7.0 (March 2017), though effectively unused as no
device in the current systemd hwdb has any devices labelled for wheel tilt.
GTK3 does not have code to handle it in a special matter and mutter doesn't do
anything with wheel tilt either, so weston would be the only one.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
2 jobs for wip/wheel-tilt in 2 minutes and 37 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
failed #97860
build-native-autotools

00:02:37

failed #97861
build-native-meson

00:02:28

 
Name Stage Failure
failed
build-native-autotools Build
and LIBINPUT_BACKEND_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
Uploading artifacts...
WARNING: build-*/weston-*.tar.xz: no matching files
build-*/*.log: found 1 matching files
WARNING: build-*/logs: no matching files
prefix-*: found 54 matching files
Uploading artifacts to coordinator... ok id=97860 responseStatus=201 Created token=oj_Q-xbG
ERROR: Job failed: exit code 1
failed
build-native-meson Build

meson.build:145:0: ERROR: Invalid version of dependency, need 'libinput' ['>= 1.7.0'] found '1.6.3'.

A full log can be found at /builds/whot/weston/build-weston-ba4100cb0d64d30987ec00a81ad9835ab789b4f4-97861/meson-logs/meson-log.txt
Uploading artifacts...
build-*/meson-logs: found 2 matching files
prefix-*: found 54 matching files
Uploading artifacts to coordinator... ok id=97861 responseStatus=201 Created token=JRzy6-yB
ERROR: Job failed: exit code 1