Remove mentions to the sponsorship program

git-svn-id: https://svn.osgeo.org/gdal/trunk@27425 f0d54148-0727-0410-94bb-9a71ac55c965
/vsistdout/: add VSIStdoutSetRedirection() for compatibility with MapServer FCGI (https://github.com/mapserver/mapserver/pull/4858)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27426 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_with_coverage