feat: enable cross-compilation by default

[beckermr]

Description:

This PR turns on cross-compilation for aarch64+ppc64le by default.

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

closes #2930

[beckermr]

pre-commit.ci autofix

[beckermr]

@isuruf can you look at this to make sure the selection of minimigrators I have added makes sense?

[isuruf]

The mini-migrators probably should have better filter functions to skip any feedstock that has cross-compilation enabled for some other platform. Applying them the second time is not a no-op. i.e. f(f(x)) != f(x)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.46%. Comparing base (41dac68) to head (5e6eeba).
Report is 13 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2946   +/-   ##
=======================================
  Coverage   77.46%   77.46%           
=======================================
  Files         115      115           
  Lines       12214    12214           
=======================================
  Hits         9462     9462           
  Misses       2752     2752           

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[beckermr]

closing since travis is working