Fix CRLF -> LF conversion on read for rb_io_fdopen & rb_file_open #324

Job	Run time
cargo test	39s
cargo clippy	25s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-12 --enable-yjit=dev)	4m 50s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	17m 48s
make (check, --enable-yjit=dev)	25m 53s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc)	27m 18s
make (test-bundled-gems, --enable-yjit=dev)	18m 50s
make (yjit-bench, --enable-yjit=dev, --yjit-stats)	5m 1s
YJIT Ubuntu result	1s
	1h 40m 45s

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