ECW: integrate GDAL_METADATA_AND_LINUX.patch with a few fixes to make it still work with SDK 3.3, changes in GetCompressionSoftwareName() and changes to how some metadata items are not copied from source ECW to target ECW (#5029)

git-svn-id: https://svn.osgeo.org/gdal/trunk@25849 f0d54148-0727-0410-94bb-9a71ac55c965