Run ./meson.sh once, then you have

$ make

and

$ make test

available in the normal src root.

v2:

Add

$ make reconfigure

which is the meson equivalent to rerunning ./configure. Also takes
some arguments if needed. Start out with --help, as usual.

v3: Use ninja -C (Chris).

v4: Catch more automake targets and point out what's happening
(Petri).

v5: Use EOF as heredoc marker (Arek)

Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>