Build imath, openexr, opencolorio with CPM if missing #7330

Job	Run time
windows-2019 VS2019	11m 54s
windows-2022 VS2022	12m 9s
Ubuntu ${{ matrix.desc }}	0s
VFX2019 gcc6/C++14 py2.7 boost1.66 exr2.4 ocio1.1	4m 53s
${{ matrix.runner }} appleclang${{ matrix.aclang }}/C++${{ matrix.cxx_std }} py${{ matrix.python_ver }} ${{ matrix.desc }}	0s
VFX2020 gcc6/C++14 py3.7 boost1.70 exr2.4 ocio1.1	2m 15s
VFX2021 gcc9/C++17 py3.7 boost1.73 exr2.5 ocio2.0	3m 59s
VFX2021 clang10/C++14 avx2 exr2.5 ocio2.0	4m 4s
VFX2022 gcc9/C++17 py39 boost1.76 exr3.1 ocio2.1	7m 29s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	14m 40s
VFX2022 icc/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	10m 5s
VFX2022 icx/C++17 py3.9 boost1.76 exr3.1 ocio2.1 qt5.15	17m 36s
VFX2022 sanitizers	18m 35s
VFX2023 gcc11/C++17 py3.10 boost1.80 exr3.1 ocio2.2	7m 5s
VFX2024 gcc11/C++17 py3.11 boost1.82 exr3.2 ocio2.3	7m 44s
VFX2019 oldest/hobbled gcc6.3/C++14 py2.7 boost-1.66 exr-2.4 no-sse no-ocio	3m 19s
VFX2023 abi check	9m 4s
	2h 14m 51s

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