libdmtx 0.7.4

Upgrade libdmtx to version 0.7.4.  Tested on ML with XCode-4.4.1.

Closes Homebrew/homebrew#14052.

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

Formula/libdmtx.rb

@@ -1,9 +1,9 @@
 require 'formula'
 
 class Libdmtx < Formula
-  url 'http://downloads.sourceforge.net/project/libdmtx/libdmtx/0.7.2/libdmtx-0.7.2.tar.bz2'
   homepage 'http://www.libdmtx.org'
-  md5 '0684cf3857591e777b57248d652444ae'
+  url 'http://downloads.sourceforge.net/project/libdmtx/libdmtx/0.7.4/libdmtx-0.7.4.tar.bz2'
+  sha1 '016282df12c4046338b9ff73f3d8b39f023bae16'
 
   depends_on 'pkg-config' => :build
   depends_on 'imagemagick'