Remove libvpx configure option

  - Remove libvpx package

packages/ffmpeg.rb

@@ -16,7 +16,6 @@ class Ffmpeg < Package
   depends_on 'libtheora'
   depends_on 'libvoamrwbenc'
   depends_on 'libvorbis'
-  depends_on 'libvpx'
   depends_on 'libwebp'
   depends_on 'libx264'
   depends_on 'libx265'
@@ -58,10 +57,10 @@ class Ffmpeg < Package
              --enable-libvidstab \
              --enable-libvo-amrwbenc \
              --enable-libvorbis \
-             --enable-libvpx \
              --enable-libwebp \
              --enable-libx264 \
-             --enable-libx265"
+             --enable-libx265 \
+             --enable-libxvid"
   end
 
   def self.install

packages/libvpx.rb

-require 'package'
-
-class Libvpx < Package
-  version '1.6.1'
-  source_url 'https://github.com/webmproject/libvpx/archive/v1.6.1.tar.gz'
-  source_sha1 '9e41a6bb2b991f5542c264676ac452114cda9c7c'
-
-  def self.build
-    system "./configure --prefix=/usr/local \
-            --enable-shared \
-            --enable-vp8 \
-            --enable-vp9 \
-            --enable-postproc \
-            --enable-vp9-postproc \
-            --enable-webm-io"
-    system "make"
-  end
-
-  def self.install
-    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
-  end
-end