python-cffi: bump to 2.1.1

python-cffi: bump to 2.1.1

Refresh sha256 from PyPI sdist. Drop the macOS cross-compile patch;
2.1.1 already carries the sysconfig.get_platform() fix upstream.

Add test-version.sh: 2.1.1 ships the cffi-gen-src console tool, a
subcommand CLI with no version flag, so the generic per-executable
version probe fails the package ("No executables in the package
provided version"). test-version.sh skips that probe, and test.sh now
asserts cffi.__version__ against the packaged version.

Signed-off-by: Alexandru Ardelean <redacted>