Always build as a universal Binary

This removes conflicts with OpenNI and other kinect libraries. Signed-off-by: James Harris <james.russell.harris@gmail.com>

Author: James Harris

platform/osx/homebrew/libusb-freenect.rb

@@ -11,6 +11,7 @@ def patches
  end
 
  def install
+ ENV.universal_binary
  system "./autogen.sh"
  system "./configure", "--prefix=#{prefix}", "--disable-dependency-tracking", "LDFLAGS=-framework IOKit -framework CoreFoundation"
  system "make install"