Remove warp subdir

git-svn-id: https://svn.osgeo.org/gdal/trunk@27155 f0d54148-0727-0410-94bb-9a71ac55c965
warp kernel for average and mode resampler: avoid 'holes' when the source coordinates are in a reversed order from the target coordinates (#5433)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27156 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_mingw_w64