Fix Pybind11 Imath Frustum #858

Job	Run time
Linux.1: Release / steps	10m 25s
Linux.2: Debug / steps	9m 18s
Linux.3: static / steps	10m 25s
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	2m 54s
Linux.5: custom namespace / steps	10m 21s
Linux.6: clang / steps	10m 24s
Linux.7: vfx2023 / steps	10m 24s
macOS.1: Release / steps	49s
macOS.2: Debug / steps	1m 13s
macOS.3: static / steps	1m 17s
macOS.4: pkgconfig=OFF, testing=OFF / steps	33s
macOS.5: macos-13 / steps	2m 37s
Windows.1: Release / steps	2m 38s
Windows.2: Debug / steps	1m 55s
Windows.3: static / steps	2m 37s
Windows.5: pkgconfig=OFF, testing=OFF / steps	1m 58s
Windows.6: vfx2022 / steps	2m 9s
	1h 21m 57s

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