Remove sdl dependeny from pages that also have sdl2 as a dependency

multimedia/libdriv/gst10-plugins-base.xml

@@ -105,7 +105,6 @@
       <xref linkend="gtk3"/> (for examples),
       <xref linkend="opus"/>,
       <xref linkend="qt5"/> (for examples),
-      <xref linkend="sdl"/>,
       <xref linkend="sdl2"/>,
       <xref linkend="valgrind"/>,
       <ulink url="https://pypi.org/project/hotdoc">hotdoc</ulink>,

multimedia/libdriv/mlt.xml

@@ -82,7 +82,6 @@
       <xref linkend='doxygen'/>,
       <xref linkend='fftw'/>,
       <xref linkend="libexif"/>,
-      <xref linkend="sdl"/>,
       <xref linkend="sdl2"/>,
       <ulink url="https://jackaudio.org">JACK</ulink>,
       <ulink url="https://www.ipswitch.com/moveit/">MOVEit</ulink>,

multimedia/videoutils/vlc.xml

@@ -164,8 +164,7 @@
       <xref linkend="fribidi"/>,
       <xref linkend="librsvg"/>,
       <xref linkend="libvdpau"/>,
-      <xref linkend="sdl"/>
-      (with <ulink url="https://github.com/libsdl-org/SDL_image">SDL_image</ulink>),
+      <xref linkend="sdl"/>,
       <ulink url="https://github.com/cacalabs/libcaca">libcaca</ulink>, and
       <ulink url="https://github.com/Intel-Media-SDK/MediaSDK">libmfx</ulink>
     </para>

postlfs/virtualization/qemu.xml

@@ -99,7 +99,6 @@
       <xref linkend="lzo"/>,
       <xref linkend="nettle"/>,
       <xref linkend="mesa"/>,
-      <xref linkend="sdl"/>,
       <xref role="nodep" linkend="vte"/> or <xref linkend="vte2"/>, and
 <!-- libcacard has been a standalone project since qemu-2.5.-->
       <ulink url="https://gitlab.freedesktop.org/spice/libcacard">libcacard</ulink>

x/lib/cogl.xml

@@ -106,8 +106,7 @@
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">
       <xref linkend="gst10-plugins-base"/>,
-      <xref linkend="gtk-doc"/>,
-      <xref linkend="sdl"/>, and
+      <xref linkend="gtk-doc"/>, and
       <xref linkend="sdl2"/>
     </para>