Add license/copyright

[SVN r31374]

configure

@@ -1,5 +1,7 @@
 #!/bin/sh
-
+# Copyright 2005 Douglas Gregor.
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
 BJAM=""
 TOOLSET=""
 BJAM_CONFIG=""