Debian: build-dep change, python-pip -> python-setuptools

[irl]

Using python-pip during the build of a package would break Debian policy as all builds must be performed using only that which is already in the Debian archive. The setup.py file for python-libfte does however require python-setuptools.

This patch has already been applied in the version I uploaded to the Debian archives.

[kpdyer]

Thank you!