put in declrations to get rid of compiler warnings

git-svn-id: http://svn.osgeo.org/postgis/trunk@12875 b70326c6-7e19-0410-871a-916f4a2858ee
Put back varint.h to get rid of compiler warnings

git-svn-id: http://svn.osgeo.org/postgis/trunk@12876 b70326c6-7e19-0410-871a-916f4a2858ee