Support for `rb_io_mode_t` (#129) #453

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 2.7	50s
ubuntu-24.04 3.0	24s
ubuntu-24.04 3.1	20s
ubuntu-24.04 3.2	25s
ubuntu-24.04 3.3	20s
ubuntu-24.04 3.4	11s
ubuntu-24.04 debug	26s
ubuntu-24.04 head	23s
ubuntu-24.04 jruby-head	1m 23s
ubuntu-24.04 truffleruby-head	44s
ubuntu-22.04 2.7	48s
ubuntu-22.04 3.0	20s
ubuntu-22.04 3.1	23s
ubuntu-22.04 3.2	22s
ubuntu-22.04 3.3	25s
ubuntu-22.04 3.4	19s
ubuntu-22.04 debug	32s
ubuntu-22.04 head	19s
ubuntu-22.04 jruby-head	44s
ubuntu-22.04 truffleruby-head	43s
	10m 25s

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