New formula: libpgm

Libpgm is from OpenPGM, An implementation of the PGM reliable
multicast protocol.  It's a dep for zeromq that fixes zeromq
so that it compiles on ML.  Tested with clang and llvm from
XCode-4.4.1.

Fixes Homebrew/homebrew#14210

Closes Homebrew/homebrew#14290.

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

Formula/libpgm.rb

@@ -0,0 +1,19 @@
+require 'formula'
+
+class Libpgm < Formula
+  homepage 'http://code.google.com/p/openpgm/'
+  url 'http://openpgm.googlecode.com/files/libpgm-5.2.119%7Edfsg.tar.gz'
+  sha1 '8ac7e61716a7911ec8c1608cea8cf59d841b2d9d'
+  version '5.2.119'
+
+  option :universal
+
+  def install
+    cd 'openpgm/pgm' do
+      ENV.universal_binary if build.universal?
+      system "./configure", "--disable-dependency-tracking",
+                            "--prefix=#{prefix}"
+      system "make install"
+    end
+  end
+end