Let CFFI figure out timeval member types

[lunkwill42]

These typedefs should allow CFFI to figure out by itself which integer types are used for struct timeval members on the target platform.

Fixes #2 (maybe, I'll let @he32 test it first)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ PYTHON	isort	6		0	0	0.34s
✅ PYTHON	ruff	6		0	0	0.22s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[lunkwill42]

@he32 has tested on NetBSD and it appears to work for him; NetBSD/pkgsrc-wip@900772a

[stveit]

From what I can find online it does seem like typedef int... should solve this