OIIO installs cmake and pkgconfig in lib64

[jfpanisset]

When running build_oiio.sh in the aswf/ci-oiio:2026 image:

-- Installing: /usr/local/lib64/pkgconfig/OpenImageIO.pc
-- Installing: /usr/local/lib64/cmake/OpenImageIO/OpenImageIOConfig.cmake
-- Installing: /usr/local/lib64/cmake/OpenImageIO/OpenImageIOConfigVersion.cmake
-- Installing: /usr/local/lib64/cmake/OpenImageIO/OpenImageIOTargets.cmake
-- Installing: /usr/local/lib64/cmake/OpenImageIO/OpenImageIOTargets-release.cmake

Not sure why it decides to do that.

[jfpanisset]

Similarly it installs its DSOs and Python build artifacts in /usr/local/lib64:

-- Installing: /usr/local/lib64/libOpenImageIO_Util.so.3.1.13
-- Installing: /usr/local/lib64/libOpenImageIO_Util.so.3.1
-- Set non-toolchain portion of runtime path of "/usr/local/lib64/libOpenImageIO_Util.so.3.1.13" to "$ORIGIN:$ORIGIN/lib64:$ORIGIN/../lib64:/usr/local/lib"
-- Installing: /usr/local/lib64/libOpenImageIO_Util.so
-- Installing: /usr/local/lib64/libOpenImageIO.so.3.1.13
-- Installing: /usr/local/lib64/libOpenImageIO.so.3.1
-- Set non-toolchain portion of runtime path of "/usr/local/lib64/libOpenImageIO.so.3.1.13" to "$ORIGIN:$ORIGIN/lib64:$ORIGIN/../lib64:/usr/local/lib"
-- Installing: /usr/local/lib64/libOpenImageIO.so
...
-- Installing: /usr/local/lib64/python3.13/site-packages/OpenImageIO/OpenImageIO.cpython-313-x86_64-linux-gnu.so
-- Set non-toolchain portion of runtime path of "/usr/local/lib64/python3.13/site-packages/OpenImageIO/OpenImageIO.cpython-313-x86_64-linux-gnu.so" to "$ORIGIN:$ORIGIN/lib64:$ORIGIN/../lib64:/usr/local/lib"
-- Installing: /usr/local/lib64/python3.13/site-packages/OpenImageIO/__init__.py
-- Installing: /usr/local/lib64/python3.13/site-packages/OpenImageIO/__init__.pyi
-- Installing: /usr/local/lib64/python3.13/site-packages/OpenImageIO/py.typed