/vsicurl/: Avoid listing directory content when GDALOpening files like /vsizip/vsicurl/http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Eurasia/N43E001.hgt.zip while doing useless probing for .zip.aux.xml, .zip.aux, ... files

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25640 f0d54148-0727-0410-94bb-9a71ac55c965