sci-libs/gdal: fix LICENSE

sci-libs/gdal: fix LICENSE

Based on the upstream license information[0], add the missing
licenses. The license breakdown of individual components are as
follows:

gdal/frmts/gtiff/tif_float.c: BSD
gdal/frmts/hdf4/hdf-eos/*: MIT (--without-hdf4 in ebuild)
gdal/frmts/pcraster/libcsf: BSD (--without-pcraster in ebuild)
gdal/frmts/grib/degrib/*: Public Domain
port/cpl_minizip*: Info-ZIP
gdal/ogr/ogrsf_frmts/dxf/intronurbs.cpp: BSD
gdal/alg/thinplatespline.cpp: MIT
gdal/alg/libqhull: not present in the source tarball
gdal/frmts/pdf/pdfdataset.cpp: MIT
gdal/frmts/mrf/*: not present in the source tarball

[0] http://svn.osgeo.org/gdal/trunk/gdal/LICENSE.TXT

Package-Manager: portage-2.2.28