Add support for macOS #171

Job	Run time
Clippy	9s
Miri	1m 10s
Clippy (--no-default-features --features="c-allocator")	15s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc, qemu-s390...	53s
Clippy (--no-default-features --features="rust-allocator")	9s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 0s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	28s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	38s
wasm32	15s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	39s
Build and test (stable, macos-latest, x86_64-apple-darwin)	46s
Build and test (stable, macos-14, aarch64-apple-darwin)	42s
	7m 4s

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