Add Android support

[mhsmith]

Work in progress. The plan is to use this to replace cibuildwheel's limited built-in support for adding external libraries to an Android wheel.

This involves cross-compilation, so it's related to #512, though the two PRs don't have much of an overlap.

[codecov]

Codecov Report

❌ Patch coverage is 45.94595% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.96%. Comparing base (5b18e35) to head (38a59c5).

Files with missing lines	Patch %	Lines
src/auditwheel/policy/__init__.py	25.00%	19 Missing and 2 partials ⚠️
src/auditwheel/lddtree.py	33.33%	10 Missing and 6 partials ⚠️
src/auditwheel/main_repair.py	40.00%	9 Missing and 3 partials ⚠️
src/auditwheel/wheel_abi.py	63.63%	3 Missing and 1 partial ⚠️
src/auditwheel/libc.py	62.50%	2 Missing and 1 partial ⚠️
src/auditwheel/repair.py	60.00%	1 Missing and 1 partial ⚠️
src/auditwheel/wheeltools.py	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #643      +/-   ##
==========================================
- Coverage   80.60%   78.96%   -1.65%     
==========================================
  Files          22       22              
  Lines        1815     1873      +58     
  Branches      338      350      +12     
==========================================
+ Hits         1463     1479      +16     
- Misses        269      302      +33     
- Partials       83       92       +9     

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