New formula libzzip

The ZZIPlib provides read access on ZIP-archives. The library uses only
the patent-free compression-algorithms supported by Zlib. It provides
functions that transparently access files being either real files or zipped
files, both with the same filepath.

Formula/libzzip.rb

@@ -0,0 +1,14 @@
+require 'formula'
+
+class Libzzip <Formula
+  url 'http://downloads.sourceforge.net/project/zziplib/zziplib13/0.13.57/zziplib-0.13.57.tar.bz2'
+  homepage 'http://sourceforge.net/projects/zziplib/'
+  md5 '7ebb644bbd880b130435ce6dcbd3cdd3'
+
+  depends_on 'pkg-config'
+
+  def install
+    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
+    system "make install"
+  end
+end