Fix zlib implicit declarations #1127

Job	Run time
mypy	26s
ruff	6s
sdist	3m 19s
pyodide	3m 48s
parse_sdl (macos-latest, 3.2.16)	40s
parse_sdl (windows-latest, 3.2.16)	43s
test-docs	3m 27s
tox (ubuntu-latest)	3m 18s
build (ubuntu-latest, 3.10, x64)	6m 17s
build (windows-latest, 3.10, x64)	3m 56s
build (windows-latest, pypy-3.10, x64)	4m 6s
build (ubuntu-latest, pypy-3.10, x64)	7m 58s
build (windows-latest, pypy-3.10, x86)	4m 39s
linux-wheels (x86_64, cp310-manylinux*)	2m 35s
build-macos (cp310-*_universal2)	1m 54s
build-macos (pp310-*)	4m 11s
linux-wheels (aarch64, cp310-manylinux*)	2m 50s
linux-wheels (aarch64, pp310-manylinux*)	2m 51s
linux-wheels (x86_64, pp310-manylinux*)	2m 51s
build (windows-latest, 3.10, x86)	3m 16s
publish	0s
	1h 3m 11s

Provide feedback