package/x11r7/xdiver_xf86-input-tslib: update download url and add hash file

The old url fallback to http://www.pengutronix.de/software/ptxdist/ instead
of http://www.pengutronix.de/software/xf86-input-tslib/download/

 breaking
the download.

To avoid such problems in the future, we also add a hash file to this
package.

[Thomas: add hash file.]

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>