[PATCH] Handle missing __suseconds64_t

I noticed the build was failing on musl x86 due to missing __suseconds64_t.
The attached patch adds an os-provides-suseconds64-t feature flag and falls
back to suseconds_t when the type is missing.

BTW, are there any non-win32 platforms still in use that lack suseconds_t
entirely? If not, the #-os-provides-suseconds-t "long" fallback might be
dead code at this point.

CI results for reference:
- Before (failing):
https://github.com/roswell/sbcl_head/actions/runs/23646018362
- After (passing):
https://github.com/roswell/sbcl_head/actions/runs/23664212234

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