A test run should really fail if it cannot find the test data, rather
then reporting success (thus masking that it never ran). Fix the test to
find it data (probably broken with the port to meson) and make it fail
if it cannot find its data.
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Switching to build in -werror in 4016c839a8
was not working properly. Adjust the CI builds to use --werror instead.
Also while doing this, enable -werror in clang builds.
Automake and autoconf are impossible to fully understand and Meson now provides
everything we need for a much smaller, faster, and more understandable build.
See http://mesonbuild.com/ for more information.
