[dev-qt/qthelp:4] Raise minimum deps to ensure correct multilib USE deps.

Package-Manager: portage-2.2.12-r1
[dev-qt/qtwebkit:4] Raise minimum deps to ensure correct multilib USE deps.

Package-Manager: portage-2.2.12-r1
[dev-qt/qtphonon:4] Raise minimum deps to ensure correct multilib USE deps.

Package-Manager: portage-2.2.12-r1