scons: fix build on Python pre-2.7

Fixes Homebrew/homebrew#31407.

Formula/scons.rb

@@ -4,6 +4,7 @@ class Scons < Formula
   homepage 'http://www.scons.org'
   url 'https://downloads.sourceforge.net/scons/scons-2.3.2.tar.gz'
   sha1 '2937f20b86d0c5f86cf31e1fa378307ed34fc20a'
+  revision 1
 
   bottle do
     cellar :any
@@ -12,6 +13,13 @@ class Scons < Formula
     sha1 "50344e59e5f99675239891ba92aaed4a70323b5e" => :lion
   end
 
+  # Upstream patch to fix compatibility with Python pre-2.7
+  # https://bitbucket.org/scons/scons/commits/1444ad9af1d3b6148451af3f0596cba0ad352c50
+  patch :p2 do
+    url "https://bitbucket.org/scons/scons/commits/1444ad9af1d3b6148451af3f0596cba0ad352c50/raw/"
+    sha1 "022a40b4226d85d82a8145d08443495f31a9ed34"
+  end
+
   def install
     bin.mkpath # Script won't create this if it doesn't already exist
     man1.install gzip('scons-time.1', 'scons.1', 'sconsign.1')