bitshifter / glam-rs / 32240540256

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fix: fix remaining 32-bit layout tests and add i686 CI coveragees (#784)

Fixes the remaining 32-bit target test failures from #770 that the
earlier Debian-driven fixes (#771, #775, #781) missed.

- `I64Vec2`/`U64Vec2`/`I64Vec4`/`U64Vec4` alignment tests hard-coded
8-byte alignment; on 32-bit targets i64/u64 align to 4 bytes. Compare
against the scalar alignment instead (same pattern as #781).
- `test_arbitrary_usize`/`test_arbitrary_isize` sized input by
`size_of::<usize>()`, but `arbitrary` ≥ 1.4 forwards `usize`/`isize` to
`u64`/`i64` (8 bytes per value on all targets), so the tests ran out of
input on 32-bit.

Adds a `test-i686` job to CI that runs all feature sets on
`i686-unknown-linux-gnu` (gcc-multilib + rustup target) so these
regressions are caught upstream instead of by downstream packagers.

Validated all 9 feature sets on i686 via `cross` (cuda, scalar-math,
libm) plus the host x86_64 suite; lints (fmt/clippy/codegen/doc) are
green.

36 of 36 new or added lines in 1 file covered. (100.0%)

95290 of 96161 relevant lines covered (99.09%)

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