Fix Pybind11 Imath Frustum #855

Job	Run time
Linux.1: Release / steps	7m 23s
Linux.2: Debug / steps	7m 22s
Linux.3: static / steps	7m 23s
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	2m 57s
Linux.5: custom namespace / steps	7m 25s
Linux.6: clang / steps	7m 25s
Linux.7: vfx2023 / steps	7m 25s
macOS.1: Release / steps	1m 11s
macOS.3: static / steps	1m 7s
macOS.4: pkgconfig=OFF, testing=OFF / steps	36s
macOS.2: Debug / steps	1m 15s
macOS.5: macos-13 / steps	2m 10s
Windows.1: Release / steps	2m 51s
Windows.2: Debug / steps	2m 30s
Windows.3: static / steps	2m 43s
Windows.5: pkgconfig=OFF, testing=OFF / steps	2m 12s
Windows.6: vfx2022 / steps	1m 48s
	1h 5m 43s

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