utils/genrandconfig: drop outdated python-nfc check

Commit 9ea528f8 (package/python-nfc: bump to version 0.13.5) changed the
python-nfc package to download from github, so the package no longer needs
bzr on the host.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>