#2878 get rid of duplicate definition of hexbytes_from_bytes (already defined in lwout_wkb.c) get rid of liblwgeom.h (already included via liblwgeom_internal.h), get rid of varint.h include (already included via lwout_twkb.c)

git-svn-id: http://svn.osgeo.org/postgis/trunk@12871 b70326c6-7e19-0410-871a-916f4a2858ee