wasi: fix wasm-wasi-musl SYMLINK_{NO,}FOLLOW constants and enable tests #22684
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Zig's copy of the
SYMLINK_{NO,}FOLLOW
constants from wasi-musl was wrong, as were theIFIFO
andIFSOCK
file type flags. Fix these up, and add comments pointing to exactly where they come from (as wasi-musl has lots of unused, different definitions of these constants).Add tests for the Zig convention that WASM preopen 3 is the current working directory. This is true for WASM with or without libc.
Enable several fs and posix tests that are now passing (not necessarily because of this change) on wasm targets.
Fixes #20890.