gnu: python-wrapper: Propagate input python.

* gnu/packages/python.scm (python-wrapper): Propagate input python, so that
    the python libraries are made available as well as the python3 binaries
    without the symbolic links.

gnu/packages/python.scm

@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
 ;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
+;;; Copyright © 2013, 2014 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2014 Federico Beffa <beffa@fbengineering.ch>
@@ -221,7 +221,7 @@ data types.")
     (name "python-wrapper")
     (source #f)
     (build-system trivial-build-system)
-    (inputs `(("python" ,python)))
+    (propagated-inputs `(("python" ,python)))
     (arguments
      `(#:modules ((guix build utils))
        #:builder