Update Formula: zint

Version bump to 2.4.1

Signed-off-by: David Höppner <0xffea@gmail.com>

Formula/zint.rb

@@ -1,16 +1,15 @@
 require 'formula'
 
 class Zint <Formula
-  url 'http://downloads.sourceforge.net/project/zint/zint/2.4/zint-2.4.0.src.tar.gz'
+  url 'http://downloads.sourceforge.net/project/zint/zint/2.4.1/zint-2.4.1.tar.gz'
   homepage 'http://www.zint.org.uk'
-  md5 '31fbb05dc45d3c460075096b702cefb0'
+  md5 '7ec4441907827fa613b11847a467c61d'
   head 'git://zint.git.sourceforge.net/gitroot/zint/zint'
 
   depends_on 'cmake'
   depends_on 'libpng'
 
   def install
-    mkdir('build')
     cd('build')
     system "cmake ..  #{std_cmake_parameters} -DCMAKE_PREFIX_PATH=#{prefix} -DCMAKE_C_FLAGS=-I#{Formula.factory('libpng').include}"
     system "make install"