[A5rocks]

Fixes #3466

This is actually somewhat similar to #3468 since it turns out cryptography doesn't ship wheels for x86 windows anymore (wow! unbelievable!), and so we try building it and that fails since it's Windows. Either we can figure out all the right environment (e.g. have openssl), or we can avoid installing cryptography. (I may want to rename the environment variable we check, too.)

Additionally, we cannot avoid installing cryptography using environment markers, since platform_machine is for the machine rather than the build of Python, and the environment markers are in general exactly the same.

The upside is that this makes the actual skipping logic extremely simple!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00000%. Comparing base (59d94d7) to head (92e17e1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@               Coverage Diff               @@
##                 main        #3515   +/-   ##
===============================================
  Coverage   100.00000%   100.00000%           
===============================================
  Files             128          128           
  Lines           19454        19474   +20     
  Branches         1321         1323    +2     
===============================================
+ Hits            19454        19474   +20     

Files with missing lines	Coverage Δ
src/trio/_tests/pytest_plugin.py	100.00000% <100.00000%> (ø)
src/trio/_tests/test_dtls.py	100.00000% <100.00000%> (ø)
src/trio/_tests/test_exports.py	100.00000% <100.00000%> (ø)
src/trio/_tests/test_ssl.py	100.00000% <100.00000%> (ø)
src/trio/_tests/tools/test_gen_exports.py	100.00000% <100.00000%> (ø)
src/trio/_tests/tools/test_sync_requirements.py	100.00000% <100.00000%> (ø)

... and 2 files with indirect coverage changes

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