fix macos portability issues (sixth batch) #10017

Job	Run time
validate commits	10s
Generate build matrix	7s
python linting	30s
spelling	5s
bookworm - test-install	11m 59s
bookworm - 32 bit	12m 57s
noble - test-install	12m 43s
el9 - test-install	12m 3s
alpine - test-install	12m 15s
fedora40 - test-install	11m 59s
jammy - test-install	11m 44s
focal - py3.8	16m 47s
bookworm - gcc-12,content-s3,distcheck	19m 59s
fedora40 - clang-18	16m 44s
coverage	24m 29s
el8 - ascii	19m 39s
el8 - test-install	13m 3s
el8 - system,coverage	7m 36s
inception	21m 28s
flux-pam check	4m 27s
flux-accounting check	4m 42s
flux-pmix check	13m 26s
macos build only	2m 54s
flux-sched check	6m 53s
Generate docker manifest	1s
	4h 18m 40s

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