gh-103438: Don't define CTYPES_PASS_BY_REF_HACK on aarch64 or riscv64

[andreas-schwab]

This was a workaround for a bug in libffi that has been fixed.

• Issue: Don't define CTYPES_PASS_BY_REF_HACK on aarch64 or riscv64 #103438

[ghost]

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[FFY00]

We should probably add a comment on test_pass_by_value linking to GH-103438 and noting that it's possible the user is using an older libffi if the test is failing.

We also need a news entry documenting this change.

[ronaldoussoren]

We should probably add a comment on test_pass_by_value linking to GH-103438 and noting that it's possible the user is using an older libffi if the test is failing.

We also need a news entry documenting this change.

"And older libffi" is also the version included with macOS (the current SDK headers claim to be 3.4rc1). If I understand correctly unconditionally removing this workaround would therefore break macOS builds that use the system libffi, including our own installers.