[kde-base/plasma-workspace] Call qtpaths explicitly so we can avoid adding the Qt5 bindir to PATH wrt bug #523314.

Package-Manager: portage-2.2.10
[kde-frameworks/kf-env] Avoid adding Qt5 bin dir to PATH wrt bug #523314.

The only known consumer was removed in ef689c09fe2160e891269f9644e21010d2287cc2.

Package-Manager: portage-2.2.10
[kde-frameworks/kf-env] Don't use empty phase function overrides.

pkg_preinst and src_prepare have no default implementation. src_unpack and
src_test do have default implementations, but do nothing because of empty
SRC_URI and missing make check/test target.

They're left over from the KDE 4 environment package, where they were needed
because kde4-base was inherited and exported those functions.

Package-Manager: portage-2.2.10