lib/std/: WASI code should follow POSIX semantics for AccessDenied/PermissionDenied

Use error.AccessDenied for permissions (rights) failures on Wasi
(`EACCES`) and error.PermissionDenied (`EPERM`) for systemic failures.
And pass-through underlying Wasi errors (PermissionDenied or AccessDenied)
without mapping.
02373eb2a5Pat Tullmann committed on 3/24/2025, 3:20:45 PM· committed by Alex Rønne Petersenparentf304d8e
2 files changedLine totals unavailable