PKG: add LERC as external dep, compile gdal with it
Add LERC support to gdal dependency. For this libTIFF used by Gdal must have LERC support. Thus LERC is added in libtiff and gdal deps build
Edited by Tristan Laurent
Add LERC support to gdal dependency. For this libTIFF used by Gdal must have LERC support. Thus LERC is added in libtiff and gdal deps build