Add support for macOS #166

Job	Run time
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc, qemu-s390...	54s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	32s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	26s
wasm32	17s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	34s
Clippy	13s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	41s
Clippy (--no-default-features --features="c-allocator")	26s
Build and test (stable, macos-latest, x86_64-apple-darwin)	29s
Clippy (--no-default-features --features="rust-allocator")	19s
Miri	1m 9s
Build and test (stable, macos-14, aarch64-apple-darwin)	35s
	6m 35s

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