Fix broken links found by "make linkcheck". scipy.org seems to be done right now, so I could not verify links going there.
diff --git a/Doc/faq/extending.rst b/Doc/faq/extending.rst
index 3389877..82fed97 100644
--- a/Doc/faq/extending.rst
+++ b/Doc/faq/extending.rst
@@ -48,7 +48,7 @@
If you need to interface to some C or C++ library for which no Python extension
currently exists, you can try wrapping the library's data types and functions
with a tool such as `SWIG <http://www.swig.org>`_. `SIP
-<http://www.riverbankcomputing.co.uk/sip/>`_, `CXX
+<http://www.riverbankcomputing.co.uk/software/sip/>`_, `CXX
<http://cxx.sourceforge.net/>`_ `Boost
<http://www.boost.org/libs/python/doc/index.html>`_, or `Weave
<http://www.scipy.org/site_content/weave>`_ are also alternatives for wrapping