Fix Pybind11 Imath Frustum #853

Job	Run time
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	3m 4s
Linux.3: static / steps	7m 23s
Linux.2: Debug / steps	7m 18s
Linux.1: Release / steps	7m 21s
Linux.5: custom namespace / steps	7m 22s
Linux.6: clang / steps	7m 20s
Linux.7: vfx2023 / steps	7m 22s
macOS.1: Release / steps	49s
macOS.2: Debug / steps	1m 2s
macOS.3: static / steps	57s
macOS.4: pkgconfig=OFF, testing=OFF / steps	39s
macOS.5: macos-13 / steps	2m 21s
Windows.1: Release / steps	1m 49s
Windows.2: Debug / steps	2m 41s
Windows.3: static / steps	2m 30s
Windows.5: pkgconfig=OFF, testing=OFF / steps	2m 5s
Windows.6: vfx2022 / steps	2m 23s
	1h 4m 26s

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