Add support for macOS #168

Job	Run time
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc, qemu-s390...	43s
Clippy	11s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	30s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	23s
Miri	1m 11s
Clippy (--no-default-features --features="c-allocator")	20s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	36s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	34s
Clippy (--no-default-features --features="rust-allocator")	13s
wasm32	25s
Build and test (stable, macos-latest, x86_64-apple-darwin)	39s
Build and test (stable, macos-14, aarch64-apple-darwin)	23s
	6m 8s

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