ddd: add patch for 10.9 build.

Closes Homebrew/homebrew#22462.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/ddd.rb

@@ -9,6 +9,8 @@ class Ddd < Formula
   depends_on 'lesstif'
   depends_on :x11
 
+  def patches; DATA; end
+
   def install
     system "./configure", "--disable-debug",
                           "--disable-dependency-tracking",
@@ -27,3 +29,18 @@ class Ddd < Formula
     mv bin/'dddexe', bin/'ddd'
   end
 end
+
+__END__
+diff --git a/ddd/VSLDefList.C b/ddd/VSLDefList.C
+index 55c1778..3dfc6a7 100644
+--- a/ddd/VSLDefList.C
++++ b/ddd/VSLDefList.C
+@@ -60,7 +60,7 @@ const Box *VSLDefList::eval(Box *arg) const
+     {
+	std::ostringstream s;
+	s << *arg;
+-	VSLLib::eval_error("no suiting definition for " + f_name() + s);
++	VSLLib::eval_error("no suiting definition for " + f_name() + s.str().c_str());
+     }
+
+     return d ? d->eval(arg) : 0;