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Replace hard-coded POSIX dependencies with portable code #2108

Job	Run time
benchmark-graph	47s
test (truffleruby)	59s
test (head)	1m 10s
benchmark-run-once	1m 27s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	12m 1s
benchmark-default (head)	13m 30s
benchmark-ractor (head)	6m 30s
benchmark-default (ruby)	7m 44s
benchmark-ractor-only (head)	28s
test (ruby)	43s
all-tests	4s
	45m 23s