Remove redundant SDL version check from setup.py #1169

Job	Run time
ruff	6s
mypy	26s
sdist	2m 16s
parse_sdl (windows-latest, 3.2.16)	48s
parse_sdl (macos-latest, 3.2.16)	22s
test-docs	3m 36s
build (ubuntu-latest, 3.10, x64)	6m 1s
pyodide	5m 52s
build (windows-latest, pypy-3.10, x64)	3m 42s
build (ubuntu-latest, pypy-3.10, x64)	6m 31s
tox (ubuntu-latest)	3m 35s
build (windows-latest, pypy-3.10, x86)	3m 19s
build (windows-latest, 3.10, x86)	3m 5s
build-macos (cp310-*_universal2)	1m 51s
build (windows-latest, 3.10, x64)	3m 46s
build-macos (pp310-*)	3m 30s
linux-wheels (aarch64, cp310-manylinux*)	4m 4s
linux-wheels (x86_64, pp310-manylinux*)	3m 30s
linux-wheels (aarch64, pp310-manylinux*)	3m 40s
linux-wheels (x86_64, cp310-manylinux*)	3m 55s
publish	0s
	1h 3m 55s

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