Remove dead code: misc. _WacomDeviceRec variables

The use of each of these variables was eradicated around the turn
of 2010 (commits d7dcb7d, 57fdd26, and f934866).

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Remove dead code: WacomToolArea

Functionality removed back in 2001 with commit 82e65fc

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Remove dead code: Header defines and prototypes

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Remove dead code: [xy]_padding

The values of wcmVirtualTabletPadding are only read at a single
location. Immediately prior to this read, they are set to zero.
Because a value of zero will have no effect when used, the
[xy]_padding variables are nothing more than dead code.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>