Fix for Python library path problem

[Eric S. Raymond]

Hal Murray <hmurray at megapathdsl.net>:
> 
> 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']

Yes.  The approach in my last commit won't generalize.
-- 
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

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