jags: updated to 3.1.0

Closes Homebrew/homebrew#7336.

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

Formula/jags.rb

@@ -1,23 +1,16 @@
 require 'formula'
 
 class Jags < Formula
-  url 'http://sourceforge.net/projects/mcmc-jags/files/JAGS/2.x/Source/JAGS-2.2.0.tar.gz'
+  url 'http://sourceforge.net/projects/mcmc-jags/files/JAGS/3.x/Source/JAGS-3.1.0.tar.gz'
   homepage 'http://www-fis.iarc.fr/~martyn/software/jags/'
-  md5 '83dc69ad06e963dfa29b2faf5b091e63'
+  md5 '1f84163a3e5114d30d7832fc26e54acf'
 
   def install
     ENV.fortran
 
-    arch = MacOS.prefer_64_bit? ?  '-arch x86_64' : '-arch i386'
-    compile_flags = "-mmacosx-version-min=10.5 -isysroot #{MacOS.xcode_prefix}/SDKs/MacOSX10.5.sdk #{arch}"
-    ENV['CFLAGS'] = compile_flags
-    ENV['CXXFLAGS'] = compile_flags
-    ENV['FFLAGS'] = compile_flags
-    ENV['LDFLAGS'] = compile_flags
-
     system "./configure", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
-    system "make"
     system "make install"
+    system "chmod +x #{bin}/jags"
   end
 end