* don't show the cycles when generating the build plan
(we have other places that show it now)
* interleave the different build types when generating jobs
* make the src jobs depend on the non-src jobs, as src builds
depend on eiher msys or ucrt64 build results and otherwise
will just stop due to missing deps. Could be improved by only
depending on msys/ucrt64, but this is still an improvement.
This was required to avoid running multiple builds at the same time.
But GHA now has concurrency groups which solves the same problem,
so drop that code
