Fix for Python library path problem

[Hal Murray]

devel at ntpsec.org said:
> That's right.  What we can do, though, is win under the following
> assumption: if /usr/lib/X/Y/ is in sys.path, so is /usr/local/lib/X/Y/.
> Look at this from my system: 

Bad assumption, at least on Fedora:

Python 2.7.13 (default, Sep  5 2017, 08:53:59) 
[GCC 7.1.1 20170622 (Red Hat 7.1.1-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
['', '/usr/lib/python27.zip', '/usr/lib64/python2.7', 
'/usr/lib64/python2.7/plat-linux2', '/usr/lib64/python2.7/lib-tk', 
'/usr/lib64/python2.7/lib-old', '/usr/lib64/python2.7/lib-dynload', 
'/usr/lib64/python2.7/site-packages', '/usr/lib/python2.7/site-packages']


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