make.sh: Removal of four python2 modules

make.sh: Removal of four python2 modules

- Removal of python-clientform, python-feedparser, python-mechanize
   and python-rssdler addons - lfs and rootfiles
- python-clientform was made obsolete in 2008 and its functions taken
   over by python-mechanize
- python-rssdler is an RSS feed downloader to facilitate downloading of
   podcasts, videocasts and torrents. Current IPFire version is 0.4.0a
   from 2008. The most recent version available is 0.4.2 from 2009. No
   further development is being done with this module. An RSS feed
   downloader is not appropriate for use in a firewall system, even
   less so when it is 12 years old.
- python-feedparser and python-mechanize are both dependencies for
   python-rssdler. They are not dependencies for any other addon.
- Full clean build with these four modules fully removed gave no problems.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>