*/*: make "vpx" a global use flag

Make the "vpx" flag global, as it is used semi-consistently across
a number of packages to enable VP8/VP9 decoding (and/or encoding),
using media-libs/libvpx.  Remove the redundant descriptions where they
don't add helpful information.

This was originally proposed in 2010, but was not followed through:
https://archives.gentoo.org/gentoo-dev/201007311337.40902.hanno@gentoo.org/

Signed-off-by: Michał Górny <mgorny@gentoo.org>

games-engines/scummvm/metadata.xml

@@ -18,7 +18,6 @@
     <flag name="parport">Enable parallel port support via <pkg>sys-libs/libieee1284</pkg></flag>
     <flag name="sndio">Enable support for MIDI music using <pkg>media-sound/sndio</pkg></flag>
     <flag name="unsupported">enable unsupported and/or broken game engines (you're on your own)</flag>
-    <flag name="vpx">Enable VP8/VP9 codec support via <pkg>media-libs/libvpx</pkg></flag>
   </use>
   <upstream>
     <remote-id type="sourceforge">scummvm</remote-id>

games-fps/eduke32/metadata.xml

@@ -27,7 +27,6 @@
 		<flag name="tools">Install the support tools for mapster32.</flag>
 		<flag name="voidsw">Enable support for Shadow Warrior (Classic) through VoidSW.</flag>
 		<flag name="voxels">Install the Duke Nukem 3D Voxels Pack.</flag>
-		<flag name="vpx">Enable support for <pkg>media-libs/libvpx</pkg>.</flag>
 		<flag name="xmp">Enable support for <pkg>media-libs/exempi</pkg>.</flag>
 	</use>
 </pkgmetadata>

media-libs/avidemux-plugins/metadata.xml

@@ -12,7 +12,6 @@
     <flag name="fdk">Adds support for encoding AAC using <pkg>media-libs/fdk-aac</pkg>.</flag>
     <flag name="fribidi">Enable unicode bidirectional algorithm support via <pkg>dev-libs/fribidi</pkg>.</flag>
     <flag name="twolame">Enable TwoLAME support via <pkg>media-sound/twolame</pkg>, an optimised MPEG Audio Layer 2 (MP2) encoder.</flag>
-    <flag name="vpx">Enable WebM VP8 Codec SDK support via <pkg>media-libs/libvpx</pkg>.</flag>
     <flag name="x265">Enables HEVC support with <pkg>media-libs/x265</pkg>.</flag>
   </use>
   <upstream>

media-libs/libopenglrecorder/metadata.xml

@@ -7,7 +7,6 @@
 	</maintainer>
 	<use>
 		<flag name="openh264">Enable H.264 support using <pkg>media-libs/openh264</pkg></flag>
-		<flag name="vpx">Enable VP8/VP9 codec support via <pkg>media-libs/libvpx</pkg></flag>
 	</use>
 	<upstream>
 		<remote-id type="github">Benau/libopenglrecorder</remote-id>

media-libs/xine-lib/metadata.xml

@@ -61,9 +61,6 @@
 		<flag name="vis">
 			Adds support for SIMD optimizations for UltraSPARC processors.
 		</flag>
-		<flag name="vpx">
-			Enable VP8 codec support via <pkg>media-libs/libvpx</pkg>.
-		</flag>
 		<flag name="xvmc">
 			Enable support for XVideo Motion Compensation (accelerated mpeg playback).
 		</flag>

media-plugins/gst-plugins-meta/metadata.xml

@@ -15,7 +15,5 @@ since gstreamer plugins are all run-time dependencies.
 	<flag name="http">Enable http streaming via <pkg>net-libs/libsoup</pkg></flag>
 	<flag name="libvisual">Enable visualization effects via 
 		<pkg>media-libs/libvisual</pkg></flag>
-	<flag name="vpx">Enables vp8 codec support using libvpx, required to
-		play some HTML5 videos</flag>
 </use>
 </pkgmetadata>

media-tv/mythtv/metadata.xml

@@ -26,7 +26,6 @@
 		<flag name="nvdec">Enable NVDEC (NVCUVID) hardware accelerated video decoding</flag>
 		<flag name="perl">Build the perl bindings for MythTV</flag>
 		<flag name="vbox">V@Box Communications network-attached tuner devices support</flag>
-		<flag name="vpx">Enable VP8/VP9 support for <pkg>media-libs/libvpx</pkg></flag>
 		<flag name="wrapper">Use Ubuntu mythtfrontend wrapper</flag>
 		<flag name="x265">Enable h265 encoding using x265</flag>
 		<flag name="xmltv">Support <pkg>media-tv/xmltv</pkg> TV listing - not used by Schedules Direct]</flag>

media-video/simplescreenrecorder/metadata.xml

@@ -4,7 +4,6 @@
   <!-- maintainer-needed -->
   <use>
     <flag name="asm">Enable x86 assembly optimisation.</flag>
-    <flag name="vpx">Enable VP8 codec support via <pkg>media-libs/libvpx</pkg>.</flag>
   </use>
   <upstream>
     <remote-id type="github">MaartenBaert/ssr</remote-id>

media-video/vlc/metadata.xml

@@ -49,7 +49,6 @@
 		<flag name="tremor">Enable tremor, a fixed-point version of the Ogg Vorbis decoder</flag>
 		<flag name="twolame">Enable twolame support (MPEG Audio Layer 2 encoder)</flag>
 		<flag name="upnp">Enable support for the Intel SDK stack based UPnP discovery module instead of CyberLink</flag>
-		<flag name="vpx">Enable the decoder(s) from the WebM VP8 / VP9 Codec SDK</flag>
 		<flag name="X">Enable support for e.g. fullscreen mode via X and the X C-language binding. It does not build a graphical interface</flag>
 		<flag name="x265">Support X265 Encoder</flag>
 		<flag name="zeroconf">Enable support for zero-configuration networking via avahi</flag>

net-libs/pjproject/metadata.xml

@@ -24,7 +24,6 @@
 		<flag name="silk">Include SILK support in the build</flag>
 		<flag name="srtp">Enable support for encrypted voice transmission (secure RTP)</flag>
 		<flag name="v4l2">Include Video4Linux v2 support in the build</flag>
-		<flag name="vpx">Include VP8 and VP9 codec support in the build</flag>
 		<flag name="webrtc">Enable WebRTC support</flag>
 	</use>
 	<upstream>

profiles/use.desc

@@ -368,6 +368,7 @@ videos - Install optional video files (used in some games)
 vim-syntax - Pulls in related vim syntax scripts
 vnc - Enable VNC (remote desktop viewer) support
 vorbis - Add support for the OggVorbis audio codec
+vpx - Add support for VP8/VP9 codecs (usually via media-libs/libvpx)
 vulkan - Add support for 3D graphics and computing via the Vulkan cross-platform API
 wavpack - Add support for wavpack audio compression tools
 wayland - Enable dev-libs/wayland backend

x11-wm/xpra/metadata.xml

@@ -28,7 +28,6 @@
 	<flag name="qrcode">Enable generating QRCodes for server URL via <pkg>media-gfx/qrencode</pkg></flag>
 	<flag name="trayicon">Enable system tray icon</flag>
 	<flag name="server">Build server-side code</flag>
-	<flag name="vpx">Enable vpx image format support</flag>
 	<flag name="webcam">Enable webcam support via opencv</flag>
 	<flag name="xdg">Enable support for XDG-based menus</flag>
 </use>