Tests

Fix librt compilation on platforms with OpenMP #20115

Job	Run time
Test mypyc suite with 32-bit Python	9m 35s
Test suite with py314-ubuntu, mypyc-compiled	14m 44s
Test suite with py311-ubuntu	9m 34s
Test suite with py314t-ubuntu, mypyc-compiled	17m 26s
Formatting and code style with Black + ruff	1m 58s
mypyc runtime tests with py313-macos	5m 49s
Type check our own code (py310-ubuntu)	1m 42s
Type check our own code (py310-windows-64)	2m 49s
Test suite with py314-windows-64	27m 27s
Test suite with py310-ubuntu, mypyc-compiled	14m 53s
Test suite with py313-ubuntu, mypyc-compiled	14m 26s
Test suite with py312-ubuntu	10m 1s
mypyc runtime tests with py310-ubuntu	5m 41s
Parallel tests with py314-ubuntu, interpreted	22m 32s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 6s
	3h 6m 43s

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