macos

Support for `rb_io_mode_t`. #451

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 2.7	1m 3s
macos-13 3.0	21s
macos-13 3.1	18s
macos-13 3.2	28s
macos-13 3.3	22s
macos-13 3.4	33s
macos-13 debug	25s
macos-13 head	29s
macos-14 2.7	26s
macos-14 3.0	12s
macos-14 3.1	12s
macos-14 3.2	11s
macos-14 3.3	13s
macos-14 3.4	12s
macos-14 debug	15s
macos-14 head	12s
	5m 56s

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