fix void pointer test #537

Job	Run time
Test install with generated cython files	1m 0s
Python 3.7	45s
Python 3.7	2m 52s
Python 3.7	1m 36s
Python 3.8	59s
Python 3.8	2m 57s
Python 3.8	1m 21s
Python 3.9	1m 0s
Python 3.9	3m 21s
Python 3.9	1m 28s
Python 3.10	53s
Python 3.10	2m 51s
Python 3.10	1m 21s
Python 3.11	58s
Python 3.11	2m 58s
Python 3.11	1m 28s
Test installation using newest version of Taskflow	30s
Test installation using system supplied libs	32s
Test sse2 code on Linux (gcc)	1m 48s
	30m 38s

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