autotools: include meson_get_version

Otherwise meson won't read the VERSION file and won't set a version.
That means that pkg-config files will have version unset as well.

Fixes: 3e9533d9
       ("meson: Add script to use VERSION file for getting version")
Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
(cherry picked from commit bc2fdb97)