[PATCH libinput 0/5] Enable meson as build system

[Peter Hutterer]

This adds meson as a build system, for now in parallel to autotools but if
everything goes well expect autotools to be removed in a future release. So
better get on the meson bandwagon.

There are a couple of minor differences, the biggest is probably that the
test run doesn't automatically run valgrind anymore.  gcov is provided
natively through meson (though I haven't tested this yet), so that bit goes
away. The rest is pretty much straightforward.

Cheers,
  Peter