[Bug 1956202] Re: `libexpat1-dev` CMake configuration error

[Andrew Aitchison]

https://github.com/OSGeo/gdal/issues/5324 is a result of this and the
upstream https://github.com/libexpat/libexpat/issues/501

** Bug watch added: github.com/OSGeo/gdal/issues #5324
   https://github.com/OSGeo/gdal/issues/5324

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https://bugs.launchpad.net/bugs/1956202

Title:
  `libexpat1-dev` CMake configuration error

Status in Expat:
  Unknown
Status in expat package in Ubuntu:
  Confirmed

Bug description:
  Using the package provided by Ubuntu Impish results in the following
  CMake configuration error when trying to build OpenColorIO:

  ```
  […]
  CMake Error in src/OpenColorIO/CMakeLists.txt:
    Imported target "expat::expat" includes non-existent path

      "/usr/lib/include"

    in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

    * The path was deleted, renamed, or moved to another location.

    * An install or uninstall procedure did not complete successfully.

    * The installation package was faulty and references files it does not
    provide.
  […]
  ```

  This wasn't an issue in Ubuntu Hirsute as far as I can recall and is
  not an issue when using the ASWF-provided packages — CMake flag
  `-DOCIO_INSTALL_EXT_PACKAGES=ALL`. A patch is attached that allows
  OpenColorIO to build using system-provided packages.

  Further information in the related ticket in the OpenColorIO
  repository:
  https://github.com/AcademySoftwareFoundation/OpenColorIO/issues/1415#issuecomment-1003826550

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