Wrong dependencies for multi-arch binaries

pkgme-binary does not currently deals very well with packages that require special handling on amd64. A common debian/control file looks something like this:

Build-Depends: debhelper (>= 8.0.0), imagemagick, libasound2,
         libgstreamer-plugins-base0.10-0, libgstreamer0.10-0,
         libldap-2.4-2, libldap-2.4-2, libmpg123-0,
        libsm6, libice6, libgl1-mesa-glx, libgphoto2-2,
         libgphoto2-port0, libglu1-mesa, libopenal1, libmpg123-0,
        ia32-libs [amd64], ia32-libs-multiarch [amd64]

So pkgme-binary needs to be able to resolve the lib dependencies once for i386 and once for amd64 and if they differ write addtional amd64 tags.