Add support for macOS #174

Job	Run time
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc, qemu-s390...	1m 42s
Miri	1m 11s
Clippy	44s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	2m 2s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 23s
Clippy (--no-default-features --features="c-allocator")	28s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	49s
Clippy (--no-default-features --features="rust-allocator")	17s
wasm32	39s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	40s
Build and test (stable, macos-latest, x86_64-apple-darwin)	49s
Build and test (stable, macos-14, aarch64-apple-darwin)	35s
	11m 19s

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