Add test main() definition.
Also provide a test.h header with common test includes and
definitions that can be included by all test compilation
units.
taken from libva-intel-driver and properly adapted to libva-utils
Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>
Reviewed-by: Sean V Kelley <seanvk@posteo.de>
Signed-off-by: Daniel Charles <daniel.charles@intel.com>