build: support static OCIO self-builds #6695

Job	Run time
macos-13 appleclang14/C++17 py3.11 MacOS-13-Intel	26m 34s
Ubuntu latest releases gcc13 C++20 py3.12 avx2 exr3.3 ocio2.4	7m 13s
macos-14 appleclang15/C++20 py3.12 MacOS-14-ARM	7m 25s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-main avx2	5m 52s
macos-15 appleclang16/C++20 py3.13 MacOS-15-ARM	7m 7s
windows-2019 VS2019	50m 13s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	18m 18s
windows-2022 VS2022	46m 46s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	6m 49s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	7m 14s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	5m 35s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	1m 44s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	13m 17s
Ubuntu static libs gcc9 C++17 exr2.4	13m 11s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	12m 48s
Ubuntu clang-format	3m 24s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	10m 48s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.2 qt5.15	9m 58s
VFX2024 sanitizers	33m 41s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	6m 54s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	7m 49s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1	6m 6s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse	6m 19s
VFX2023 abi check	11m 37s
	5h 26m 42s

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