Update the github workflows to also do meson builds for every OS.
Additionally, make every workflow execute the built mpv executable
(except for windows and FreeBSD's waf executable) to make sure that it
runs. As an aside, FreeBSD unfortunately is a bit less elegant since it
is in a VM.
Python 2 may not be present in the CI images in the future,
but waf’s shebang line still uses its executable name.
Explicitly call the right major version of the interpreter.
Temporary solution. For now, this builds using a container image
based on openSUSE Tumbleweed with the current FFmpeg release.
More containers will be added (at least with git snapshots of FFmpeg
and libass), and Travis will eventually be replaced with something
we have more control over.
Dudemanguy
wm4
Philip Sequeira
Martin Herkt
Jan Ekström