Fix the include path for wacom-properties.h

That header file is installed in $prefix/include/xorg and exported by the
wacom driver's pkgconfig file. And that exported include path is the full one
including the xorg/ bit, so we must include it directly. And add the
dependency to meson.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
2 jobs for wip/fix-for-nondefault-prefix in 48 seconds (queued for 1 second)
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passed #6153462
container-prep

00:00:18

 
  Build
passed #6153463
build

00:00:30