Mark hy_goal_get_solution() as deprecated
Mark hy_goal_get_solution() as deprecated

Closes: #344
Approved by: j-mracek

hughsie/libhif,rpm-software-management/libhif,rpm-software-management/libdnf,edynox/libdnf,edynox/libdnf,rpm-software-management/libdnf,Conan-Kudo/libhif,Conan-Kudo/libhif,rpm-software-management/libhif,rpm-software-management/libdnf,Conan-Kudo/libhif,Conan-Kudo/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,edynox/libdnf,hughsie/libhif,rpm-software-management/libhif,hughsie/libhif,edynox/libdnf