Added xvid formula

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/xvid.rb

@@ -0,0 +1,16 @@
+require 'formula'
+
+class Xvid <Formula
+  url 'http://downloads.xvid.org/downloads/xvidcore-1.2.2.tar.gz'
+  homepage 'http://www.xvid.org'
+  md5 '2ce9b1d280d703b5bc8e702c79e660b5'
+
+  def install
+    cd 'build/generic' do
+      system "./configure", "--disable-assembly", "--prefix=#{prefix}"
+      ENV.j1 # Doesn't compile on parallel build
+      system "make"
+      system "make install" # Need to call these separately
+    end
+  end
+end