Stop using IO::NULL for feature detection
#38
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`IO::NULL`'s underlying file `/dev/null` is not always available on WASI, so use of the file on top-level code (introduced in ruby#36) causes tempfile library not to work at all on WASI.
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IO::NULL's underlying file/dev/nullis not always available on WASI, so use of the file on top-level code (introduced in #36) causes tempfile library not to work at all on WASI.Reported by ruby/ruby.wasm#556