New port graphics/tslib, touchscreen support

This is a library that handles touchscreen support, translating
evdev or other input sources to events that can be consumed by
other graphical toolkits. It's one of the ways to hook Qt up to
a framebuffer and touchscreen, for instance.

Currently has no consumers (the Qt side needs other work as well).

The one patch has been submitted and accepted upstream, but there's
no newer upstream release.