musl: introduce musl_stat_timespec cfg for struct stat #4942
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Description
Some musl targets use out-of-line timespec fields in struct stat. This property is independent of the
musl_v1_2_3switch.Add a new
musl_stat_timespeccfg and use it to control the presence of inline time fields in musl struct stat definitions, avoiding incorrect API assumptions based on musl version alone.Fixes #4939
Sources
Checklist
libc-test/semverhave been updated*LASTor*MAXareincluded (see #3131)
cd libc-test && cargo test --target mytarget);especially relevant for platforms that may not be checked in CI