Termux removed libffi 3.5.2 from its rolling package pool. The pinned URL
returns 404 and stops runtime-library staging. Pin the available 3.8.0
archive with its downloaded SHA-256, which matches the package index.
Name the package, version and URL when a download fails. Flush staging
progress so piped build logs preserve the failure order. Update the
bionic Python tests to follow the current supplier and binary layout.
Verified all 83 library/license archives and 265 staged shared libraries.
The complete staging step and its verified cache hit both returned 0.
The pinned Python ctypes extension finds its required libffi symbols.
Focused tests: 19 passed, 2 skipped. Bionic execution remains a CI gate.
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