Remove global fields #468

Job	Run time
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc, qemu-s390...	47s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	37s
Clippy	17s
cargo-c dynamic library	23s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	51s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	42s
Clippy (--no-default-features --features="c-allocator")	18s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	46s
Clippy (--no-default-features --features="std,rust-allocator")	21s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 19s
Smoke-test fuzzing targets (ubuntu-20.04, default)	1m 45s
vanilla dynamic library	25s
Build and test (stable, macos-14, aarch64-apple-darwin)	57s
Smoke-test fuzzing targets (ubuntu-20.04, c-allocator)	1m 35s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	1m 36s
Miri	1m 28s
Smoke-test fuzzing targets (ubuntu-20.04, rust-allocator)	1m 35s
Smoke-test fuzzing targets (macos-14)	1m 36s
run bzip2-rs test suite (x86_64-unknown-linux-gnu)	20s
wasm32	30s
	18m 8s

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