bug#7454: python.el sys.path improperly removes current working directory

[Chong Yidong]

Glenn Morris <rgm@gnu.org> writes:

> Brendan Miller wrote:
>
>> For unknown reasons, python.el's run-python removes the current
>> working directory from python's sys.path.
>
> The reasons are explained here
>
> http://lists.gnu.org/archive/html/emacs-devel/2008-09/msg00215.html

Dave Love's upstream version has fixed this in a different way, by
avoiding module loading from world-writable directories.  I'll merge
this in.