Sanitize always comes just before data member definitions, so
it's easy to cross-check.

When a struct is plain old data with no references, etc, it's okay
to mark its members public.

Fixed already but better to have anyway.

One didn't have minimized but it was only 164 B, so

[test] Unify font file opening across the tests

Fixes https://github.com/harfbuzz/harfbuzz/issues/1260

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11033

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11060

Closes https://github.com/harfbuzz/harfbuzz/issues/1286

Cygwin fixes and CI build