[Documentation/package.accept_keywords] Add phonon and phonon-gstreamer to stabilization list for 4.14
[kde-frameworks/kdelibs4support] Workaround build failure

ce6dbc0cc0c0684acbd50671f780be21a323dd43 enabled globally a new upstream option
in ECM, but this causes build failure in this package. Note that this option
should not actually have any effect on kdelibs4support.

Package-Manager: portage-2.2.10