crypto: improve system certificate enumeration logic on macOS #5061

Job	Run time
Build slim tarball	1m 59s
x86_64-linux: with shared libraries	21m 29s
aarch64-darwin: with shared libraries	20m 42s
aarch64-linux: with shared libraries	18m 15s
x86_64-darwin: with shared libraries	33m 49s
	1h 36m 14s

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