COMP: Fix windows numpy build error.

This commit is an attempt to fix the following error:

  File "numpy\core\setup_common.py", line 247, in long_double_representation
  24>    raise ValueError("Could not lock sequences (%s)" % saw)
  24>ValueError: Could not lock sequences (None)

To explain the changes, the content of the file "SLICER_README.txt"
now bundled in the archive is reported below:

// ------------
This archive has originally been downloaded from sourceforge.

URL http://sourceforge.net/projects/numpy/files/NumPy/1.4.1/
MD5: 5c7b5349dc3161763f7f366ceb96516b

The patches located in the "patches" subdirectory have all been
applied and are descibed below:

0001-BLD-fix-build-error-on-Windows-with-MSVC9.-Thanks-to.patch

 Generated using: git format-patch c17738a..4872cac

 Applied using: Did NOT apply cleanly. File numpy/core/setup_common.py
                manually updated.

 The issue addressed by this patch has been reported on
 the Slicer list [1] on Sept 18th 2014 and has also been
 discussed on the numpy list [2] on July 10th 2011.

 The error message was:

  File "numpy\core\setup_common.py", line 247, in long_double_representation
  24>    raise ValueError("Could not lock sequences (%s)" % saw)
  24>ValueError: Could not lock sequences (None)

 [1] http://slicer-devel.65872.n3.nabble.com/Numpy-build-error-on-trunk-tt4032488.html
 [2] http://mail.scipy.org/pipermail/numpy-discussion/2011-July/057614.html

// ------------

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23710 3bd1e089-480b-0410-8dfb-8563597acbee