Bash: remove explicit PYTHON_PATH
Bash: remove explicit PYTHON_PATH

I had added this in order to use hg, but I haven't had to touch it in a
while now, and having this here is interferring with building Vim and
Python 2.7 support (for the Gundo plug-in).

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent