Use OpenMP for threading instead of TBB #607

Job	Run time
build_linux (3.12)	3m 49s
build_linux (3.14)	4m 20s
build_linux (3.13)	4m 18s
build_linux (3.11)	3m 52s
build_linux (3.10)	3m 58s
build_windows (3.12)	8m 58s
build_windows (3.10)	8m 40s
build_windows (3.13)	9m 11s
build_windows (3.11)	8m 0s
build_windows (3.14)	8m 52s
test_linux (3.10, false, ubuntu-latest)	2m 1s
test_linux (3.14, false, ubuntu-latest)	1m 44s
test_linux (3.13, false, ubuntu-latest)	2m 21s
test_linux (3.11, false, ubuntu-latest)	1m 51s
test_linux (3.12, false, ubuntu-latest)	2m 14s
test_windows (3.13, false, windows-latest)	3m 39s
test_windows (3.14, false, windows-latest)	3m 22s
test_windows (3.10, false, windows-latest)	3m 35s
test_windows (3.12, false, windows-latest)	3m 44s
test_windows (3.11, false, windows-latest)	3m 25s
	1h 31m 54s

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