pgrouting: remove broken bottle.

And prevent them from being poured in future.

Formula/pgrouting.rb

@@ -5,11 +5,11 @@ class Pgrouting < Formula
   url "https://github.com/pgRouting/pgrouting/archive/v2.0.0.tar.gz"
   sha1 "cd2f60dc49df7bc8c789c8e73ecb9759194fab96"
 
-  bottle do
-    cellar :any
-    sha1 "5630b70733c8106498e99cd86a7dfb0efad61d99" => :yosemite
-    sha1 "e534968cb994d3d3cf0315eec1277d5339cc4984" => :mavericks
-    sha1 "a0f566240642fb80b4b906f58bab8be265521099" => :mountain_lion
+  def pour_bottle?
+    # Postgres extensions must live in the Postgres prefix, which precludes
+    # bottling: https://github.com/Homebrew/homebrew/issues/10247
+    # Overcoming this will likely require changes in Postgres itself.
+    false
   end
 
   # work around function name conflict from Postgres