OSSIM: update to 1.7.15

...otbossim/include/ossim/elevation/ossimElevationShapeIdx.h

...otbossim/include/ossim/imaging/ossimEsriShapeFileCutter.h

...otbossim/include/ossim/imaging/ossimEsriShapeFileFilter.h

...otbossim/include/ossim/imaging/ossimImageShapeFileIndex.h

...tbossim/include/ossim/imaging/ossimImageSourceInterface.h

Utilities/otbossim/include/ossim/vec/ossimShapeDatabase.h

Utilities/otbossim/include/ossim/vec/ossimShapeFile.h

Utilities/otbossim/include/ossim/vec/shapefil.h

...s/otbossim/src/ossim/elevation/ossimElevationShapeIdx.cpp

...s/otbossim/src/ossim/imaging/ossimEsriShapeFileCutter.cpp

...s/otbossim/src/ossim/imaging/ossimEsriShapeFileFilter.cpp

...s/otbossim/src/ossim/imaging/ossimImageShapeFileIndex.cpp

.../otbossim/src/ossim/imaging/ossimImageSourceInterface.cpp

Utilities/otbossim/src/ossim/vec/dbfopen.c

Utilities/otbossim/src/ossim/vec/ossimShapeDatabase.cpp

Utilities/otbossim/src/ossim/vec/ossimShapeFile.cpp

Utilities/otbossim/src/ossim/vec/shpopen.c

Utilities/otbossim/src/ossim/vec/shptree.c