refactor: don't avoid sys/types.h when building for Windows

[fanquake]

We've already used it unguarded in httpserver.cpp for years, with no build issues.

Doesn't touch the usage in wallet/bdb.cpp. See #26832.

[DrahtBot]

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Reviews

See the guideline for information on the review process.
A summary of reviews will appear here.

[hebasto]

don't avoid sys/types.h on when building for Windows

Do Windows builds require any symbols from <sys/types.h>? If not, why churn the code?

[fanquake]

Does Windows builds require any symbols from <sys/types.h>?

Aside from ultimately removing pointless per-platform conditionals,

See #26832.

[hebasto]

Aside from ultimately removing pointless per-platform conditionals,

But this change does not remove per-platform conditionals.

See #26832.

Yes, I agree with cc16ab1 from #26832.

[fanquake]

But this change does not remove per-platform conditionals.

Yea, that's because this is a step towards doing so.

[fanquake]

Just going to combine this into #26832.