ffmpeg5 update: Disable video acceleration in VLC.

It does not compile due to major changes in the ffmpeg API.

Upstream has stated at https://code.videolan.org/videolan/vlc/-/merge_requests/1245
and https://code.videolan.org/videolan/vlc/-/issues/26498 that video
acceleration will not be available until VLC-4 due to complexity.

introduction/welcome/changelog.xml

@@ -44,6 +44,11 @@
     <listitem>
       <para>July 12th, 2022</para>
       <itemizedlist>
+        <listitem>
+          <para>[renodr] - Disable libva support in VLC so that it builds with
+          ffmpeg-5. Upstream has said that no port will be available for VLC-3
+          due to complexity, but it will be available again in VLC-4.</para>
+        </listitem>
         <listitem>
           <para>[renodr] - Turn off ffmpeg support in libquicktime.</para>
         </listitem>

multimedia/videoutils/vlc.xml

@@ -235,6 +235,7 @@ export CPPFLAGS="$(pkg-config --cflags lua52)" &&
 
 BUILDCC=gcc ./configure --prefix=/usr    \
                         --disable-opencv \
+                        --disable-libva  \
                         --disable-vpx    &&
 
 make</userinput></screen>
@@ -279,6 +280,12 @@ make</userinput></screen>
       version of <application>vlc</application>.
     </para>
 
+    <para>
+      <parameter>--disable-libva</parameter>: This switch is required to disable
+      video acceleration in VLC since it is incompatible with ffmpeg-5, and
+      upstream has no plans to port it due to complexity.
+    </para>
+
     <para>
       <parameter>--disable-vpx</parameter>: This switch is required to disable
       <application>libvpx</application>. The latest version is not compatible