cc @AA-Turner , @emmatyping for test_zstd fail https://github.com/python/cpython/actions/runs/14894216754/job/41833346355?pr=133612

Request: @vstinner

Tests / Ubuntu (free-threading) / build and test (ubuntu-24.04) (pull_request)

test_zstd crash:

0:12:55 load avg: 14.73 [1/3/1] test_zstd worker non-zero exit code (Exit code -11 (SIGSEGV))
Re-running test_zstd in verbose mode (matching: test_compress_locking)
test_compress_locking (test.test_zstd.FreeThreadingMethodTests.test_compress_locking) ...

Fatal Python error: Fatal Python error: Segmentation faultSegmentation fault

A code search on PyPI top 8,000 projects found 2 projects, but there are only references to these 4 removed functions, these functions are not actually used. So we should be good in terms of impact.

@vstinner @StanFromIreland the zstd crash is noted in #132983 (comment). I'm still trying to figure out the cause/fix for it.