Use OpenMP for threading instead of TBB #608

Job	Run time
build_windows (3.12)	8m 23s
build_windows (3.11)	8m 54s
build_windows (3.14)	9m 39s
build_windows (3.13)	8m 40s
build_linux (3.13)	33s
build_linux (3.12)	28s
build_linux (3.11)	43s
build_linux (3.14)	34s
build_linux (3.10)	32s
build_windows (3.10)	9m 4s
test_linux	0s
test_windows (3.12, false, windows-latest)	3m 17s
test_windows (3.13, false, windows-latest)	3m 38s
test_windows (3.10, false, windows-latest)	3m 33s
test_windows (3.11, false, windows-latest)	3m 34s
test_windows (3.14, false, windows-latest)	3m 28s
build_linux (3.12)	3m 16s
build_linux (3.10)	3m 20s
build_linux (3.14)	3m 31s
build_linux (3.11)	3m 18s
build_linux (3.13)	3m 31s
build_windows (3.13)	8m 40s
build_windows (3.12)	8m 23s
build_windows (3.10)	9m 4s
build_windows (3.11)	8m 54s
test_windows (3.10, false, windows-latest)	3m 33s
test_windows (3.13, false, windows-latest)	3m 38s
test_windows (3.12, false, windows-latest)	3m 17s
test_windows (3.11, false, windows-latest)	3m 34s
test_windows (3.14, false, windows-latest)	3m 28s
build_windows (3.14)	9m 39s
test_linux (3.11, false, ubuntu-latest)	1m 40s
test_linux (3.12, false, ubuntu-latest)	1m 23s
test_linux (3.13, false, ubuntu-latest)	1m 54s
test_linux (3.10, false, ubuntu-latest)	2m 5s
test_linux (3.14, false, ubuntu-latest)	1m 52s
	2h 33m 0s

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