.gitignore: add missing binaries

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25952 f0d54148-0727-0410-94bb-9a71ac55c965
.gitignore: s/gdalclientserver/gdalserver

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25953 f0d54148-0727-0410-94bb-9a71ac55c965