LIBKML: add support for creating PhotoOverlay objects (without ImagePyramid)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27057 f0d54148-0727-0410-94bb-9a71ac55c965
reorder pragma calls to silence warning for gcc (#5299)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27058 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx