Test without C-extensions

fixes #956, added a safety factor to MTEXT size estimation #2232

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Run time

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Job	Run time
build (3.9)	1m 0s
build (3.10)	1m 4s
build (3.11)	1m 20s
build (3.12-dev)	1m 4s
build (pypy-3.9)	1m 24s
	5m 52s