title: Vim compiled with Python support but can't see sys version
body: <p>I compiled the development version of Vim with both Python 2 and Python 3 support. The output of <code>vim --version</code> has <code>+python/dyn</code> and <code>+python3/dyn</code> in it. I ran the configure file with 
  g
  <code>./configure --enable-pythoninterp --enable-python3interp --with-python-config-dir=/usr/lib64/python2.7/config --with-python3-config-dir=/usr/lib64/python3.3/config --with-x --with-features=huge</code></p>
  
  <p>However when I run <code>:python import sys; print(sys.version)</code> I get </p>
  
  <pre><code>E448: Could not load library function _PyArg_Parse_SizeT  
  E263: Sorry, this command is disabled, the Python library could not be loaded.
  </code></pre>
  
  <p>Why would this be? I found out because of YouCompleteMe stating that it requires Vim compiled with 2.x support. </p>
  
  <p>Thanks</p>