new packages: dph-*

From #ghc:
> < slyfox> 'make install' does not install dph, does it?
> < slyfox> it seems to be buildable by stage2
> < thoughtpolice> slyfox: no, it doesn't. dph is only installed if you set InstallExtraPackages=YES
> < slyfox> thoughtpolice: oh, thanks!
> < slyfox> (gentoo had dph flag for git builds, but dph stopped installing there)
> < thoughtpolice> the dph in HEAD is out of sync with upstream anyway i think
> < thoughtpolice> dunno if you want to offer it, InstallExtraPackages gives you random/primitive/vector/dph, which all technically have their own upstreams
> < slyfox> aha
> < slyfox> so we'd better package those separately
> < thoughtpolice> right
> < slyfox> (we already do for the first 3)
> < thoughtpolice> we just keep them around for perf/regression tests
> < thoughtpolice> (hence, not installed by default)
> < slyfox> *nod*, now makes sense

Thus i've pulled those separately (most require ghc-7.6+)

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>