[wasm64] Keep nfds_t 32-bit. NFC#27115
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Use unsigned int for nfds_t instead of unsigned long. The number of file descriptors is already limited to 4096 (see `WASMFS_FD_MAX` or `FS.MAX_OPEN_FDS`), so a 64-bit nfds_t provides no benefit. Split out from emscripten-core#27108.
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sbc100
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Jun 13, 2026
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Use unsigned int for nfds_t instead of unsigned long.
The number of file descriptors is already limited to 4096 (see
WASMFS_FD_MAXorFS.MAX_OPEN_FDS), so a 64-bit nfds_t providesno benefit.
Split out from #27108.