Test without C-extensions

Fix the infinite loop in `dxf2code.py` #2362

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Run time

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Job	Run time
build (3.9)	1m 7s
build (3.10)	1m 1s
build (3.11)	52s
build (3.12)	1m 4s
build (pypy-3.9)	1m 44s
	5m 48s