package/tslib: enable statically linked building

package/tslib: enable statically linked building

tslib can be configured to be built statically linked. So let's add this option.

tslib is quite configurable and each module can be selected to be built into
the static build. This configuration includes the hardware independent filter
modules (obviously), and the Linux evdev input module.

This results in a configuration that fully supports multitouch in any
combination.

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>