Fix Pybind11 Imath Frustum #857

Job	Run time
Linux.2: Debug / steps	9m 22s
Linux.1: Release / steps	10m 15s
Linux.3: static / steps	10m 14s
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	2m 59s
Linux.6: clang / steps	10m 13s
Linux.5: custom namespace / steps	10m 10s
Linux.7: vfx2023 / steps	10m 15s
Windows.1: Release / steps	2m 13s
Windows.2: Debug / steps	2m 22s
Windows.3: static / steps	2m 45s
Windows.5: pkgconfig=OFF, testing=OFF / steps	1m 26s
macOS.1: Release / steps	52s
macOS.2: Debug / steps	1m 28s
macOS.3: static / steps	49s
macOS.4: pkgconfig=OFF, testing=OFF / steps	34s
macOS.5: macos-13 / steps	2m 23s
Windows.6: vfx2022 / steps	2m 7s
	1h 20m 27s

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