Added ability to increase the maximum number of opened HDF4 files. HDF4
library contains SDreset_maxopenfiles/SDget_maxopenfiles interface (since the
4.2.5 release) which can be used to reallocate internal file tables. We will
use these functions if available and appropriately reallocate HDF-EOS internal
arrays.


git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25847 f0d54148-0727-0410-94bb-9a71ac55c965