Drop per-device logging function, use per-library one instead

Drop per-device logging function, use per-library one instead

There's no need to have separate logging function for each device created.
More likely, libevdev will be hooked up once into the logging system and
expected to deal with it.

Plus, this allows us to log from the uinput code where we don't
have the context anyway.

Requires a rename to libevdev_set_log_function to avoid ABI breaks, and
while we're breaking the ABI make the logging function more sophisticated
to log line, number, etc.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>