[kde-base/kde-gtk-config] Remove 5.1.0 as it was not meant to be released.

https://mail.kde.org/pipermail/release-team/2014-October/008069.html
https://mail.kde.org/pipermail/release-team/2014-October/008107.html

Package-Manager: portage-2.2.12
[kde-base/kde-gtk-config] Remove conditional since we handle keywords via script.

Package-Manager: portage-2.2.12
[dev-libs/extra-cmake-modules] Remove old.

Package-Manager: portage-2.2.12