macOS CI issue

[vtjnash]

It looks like all tests fail on macOS due to a CI configuration issue:

2024-09-29T01:58:50.5279540Z E           stderr:
2024-09-29T01:58:50.5280080Z E           error: unknown warning option '-Wno-builtin-declaration-mismatch'; did you mean '-Wno-missing-declarations'? [-Werror,-Wunknown-warning-option]
2024-09-29T01:58:50.5280630Z E           error: unknown warning option '-Werror=builtin-declaration-mismatch'; did you mean '-Werror=missing-declarations'? [-Werror,-Wunknown-warning-option]
2024-09-29T01:58:50.5281180Z E           error: unknown warning option '-Wno-discarded-qualifiers'; did you mean '-Wno-ignored-qualifiers'? [-Werror,-Wunknown-warning-option]
2024-09-29T01:58:50.5281670Z E           error: unknown warning option '-Wno-packed-not-aligned'; did you mean '-Wno-over-aligned'? [-Werror,-Wunknown-warning-option]