Bump ffmpeg version to 2.4.2

Author: ntpz

build.sh

@@ -52,7 +52,7 @@ cd $BUILD_DIR
 ../fetchurl "http://downloads.xvid.org/downloads/xvidcore-1.3.3.tar.gz"
 ../fetchurl "http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz"
 ../fetchurl "http://downloads.xiph.org/releases/opus/opus-1.1.tar.gz"
-../fetchurl "http://www.ffmpeg.org/releases/ffmpeg-2.3.3.tar.bz2"
+../fetchurl "http://www.ffmpeg.org/releases/ffmpeg-2.4.2.tar.bz2"
 
 echo "*** Building yasm ***"
 cd $BUILD_DIR/yasm*