added unifdef formula

Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>

Formula/unifdef.rb

@@ -0,0 +1,15 @@
+require 'formula'
+
+class Unifdef < Formula
+  url 'http://dotat.at/prog/unifdef/unifdef-2.6.tar.gz'
+  homepage 'http://dotat.at/prog/unifdef/'
+  md5 '18b832baea2c7b6b00bd7d4f3db38f62'
+
+  def install
+    system "make prefix=#{prefix} install"
+  end
+
+  def test
+    system "unifdef -V"
+  end
+end