Package failures non-deterministic

[Ham22]

Currently we run a full package build with something like this because multi-threaded builds some times fail so we give it another chance single threaded:
make -j8 IGNORE_ERRORS=m || make -j1 IGNORE_ERRORS=m V=s

The problem is that depending on when the multithread build fails we have seen that different numbers of packages are being built successfully even on the same code base.

[Ham22]

Perhaps a solution is to run this sequence of events for a build:

1. make -j8 IGNORE_ERRORS=m
2. grep log for failed packages
3. for each failed package make -j1 package/<package>/{compile,install} (even if one fails)
4. make package/index