Since we can no longer rely on distuils for a version comparison, let's
modify the macos-sdk-version script so it returns multiple potential
versions to meson. Then use meson's built-in version comparison to pick
the right one instead. This avoids the complication of needing certain
python packages installed since everything simply uses stdlib functions.
Python 3.10 deprecated disutils and then removed it in 3.12. The macos
sdk check uses the version compare from there, so it needs to be
replaced with something else. So instead use the API from the packaging
module which is also widely available and a fit replacement.
Fixes#12762.
Building for macos requires us to check the macos sdk path as well as
the sdk version that is on the system. To do this, let's steal the logic
that's in the compiler_swift.py check from the waf build. This returns a
comma-delinated string. The first entry is the absolute path to the sdk.
The second entry is the detected macos sdk version.