[dev-qt/qtwebkit:5] Remove automagic dependencies.

Package-Manager: portage-2.2.8-r1
Merge pull request #29 from xhochy/qtwebkit5-no-automagic

[dev-qt/qtwebkit:5] Remove automagic dependencies.
  + minor edits by me.
[qt5-build.eclass] Download development release if beta is not numbered
Merge pull request #31 from xhochy/qt5-eclass-no-beta-number

[qt5] Download development release if beta is not numbered