Add "x" mode option for IO.open
#6081
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From CRuby 2.6 feature. This is the "x" mode (`O_EXCL`; exclusive create) of `fopen(3)` introduced in C11. ref. https://bugs.ruby-lang.org/issues/11258
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From CRuby 2.6 feature.
This is the "x" mode (
O_EXCL; exclusive create) offopen(3)introduced in C11.ref. https://bugs.ruby-lang.org/issues/11258