`bzip2.rs`: cleanup statics #269

Job	Run time
Miri	1m 19s
Clippy	25s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 2s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc, qemu-s390...	42s
Clippy (--no-default-features --features="c-allocator")	11s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 9s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	30s
Clippy (--no-default-features --features="rust-allocator")	19s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	44s
Build and test (stable, macos-latest, x86_64-apple-darwin)	56s
wasm32	26s
Build and test (stable, macos-14, aarch64-apple-darwin)	39s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	1m 32s
	9m 54s

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