We have two useflags expressing the same thing: bidi and fribidi. I suggest collapsing it into one useflag, and to make it a global useflag.
Affected packages: dev-libs/efl/metadata.xml: <flag name="fribidi">Enable bidirectional text support</flag> games-action/supertuxkart/metadata.xml: <flag name="fribidi">Support for right-to-left languages</flag> games-strategy/megaglest/metadata.xml: <flag name="fribidi">Enable FriBIDi support</flag> games-strategy/wesnoth/metadata.xml: <flag name="fribidi">Support for right-to-left languages</flag> media-libs/avidemux-plugins/metadata.xml: <flag name="fribidi">Enable unicode bidirectional algorithm support via <pkg>dev-libs/fribidi</pkg>.</flag> media-video/ffmpeg/metadata.xml: <flag name="fribidi">Enables fribidi support in the drawtext filter.</flag> media-video/vdr/metadata.xml: <flag name="bidi">fribidi support, for languages, written from right to left</flag> x11-wm/fluxbox/metadata.xml: <flag name="bidi">
