eclass/haskell-cabal.eclass: add MY_PN to cabal file search for 'cabal_chdeps'

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/chart: bump up to 1.2

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/chart-cairo: bump up to 1.2

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/chart-gtk: bump up to 1.2

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