Fixes for `ocaml_simd` #24

Job	Run time
test-macos (macos-latest)	24m 21s
test-linux (debian:bookworm, ubuntu-24.04-arm)	22m 43s
test-linux (archlinux:latest, ubuntu-latest)	27m 2s
test-macos (macos-13)	42m 46s
test-linux (ubuntu:24.04, ubuntu-24.04-arm)	21m 24s
test-linux (ubuntu:24.04, ubuntu-latest)	28m 18s
test-linux (debian:bookworm, ubuntu-latest)	28m 42s
	3h 15m 16s

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