mplayer: use ffmpeg instead of ffmpeg_3

pkgs/applications/video/mplayer/default.nix

@@ -1,4 +1,4 @@
-{ config, lib, stdenv, fetchurl, pkg-config, freetype, yasm, ffmpeg_3
+{ config, lib, stdenv, fetchurl, pkg-config, freetype, yasm, ffmpeg
 , aalibSupport ? true, aalib ? null
 , fontconfigSupport ? true, fontconfig ? null, freefont_ttf ? null
 , fribidiSupport ? true, fribidi ? null
@@ -109,7 +109,7 @@ stdenv.mkDerivation rec {
   depsBuildBuild = [ buildPackages.stdenv.cc ];
   nativeBuildInputs = [ pkg-config yasm ];
   buildInputs = with lib;
-    [ freetype ffmpeg_3 ]
+    [ freetype ffmpeg ]
     ++ optional aalibSupport aalib
     ++ optional fontconfigSupport fontconfig
     ++ optional fribidiSupport fribidi