Update zstd and bzip2 function signatures #216

Job	Run time
Address sanitizer	2m 33s
rustfmt	2m 40s
conda (ubuntu, conda-forge, stable)	1m 45s
static builds (ubuntu-latest, stable)	2m 2s
conda (windows, conda-forge, stable)	3m 29s
test apt (stable)	59s
conda (macos, conda-forge, stable)	2m 2s
static builds (windows-latest, stable-msvc)	7m 55s
test apt (beta)	56s
static builds (windows-latest, stable-gnu)	11m 32s
test apt (nightly)	55s
static builds (macos-11, stable)	3m 7s
static builds (macos-latest, stable)	3m 21s
	43m 16s

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