Updates for the HDAs to work with python3 (ie all Houdini since 19.5)… #45

Job	Run time
build (ubuntu-22.04, Debug, gcc, g++)	2m 25s
build (ubuntu-22.04, Debug, clang, clang++)	2m 38s
build (ubuntu-22.04, Release, gcc, g++)	2m 34s
build (ubuntu-22.04, Release, clang, clang++)	2m 18s
build (ubuntu-20.04, Debug, gcc, g++)	2m 20s
build (ubuntu-20.04, Debug, clang, clang++)	2m 26s
build (ubuntu-20.04, Release, gcc, g++)	2m 43s
build (ubuntu-20.04, Release, clang, clang++)	2m 23s
	19m 47s

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