python-optional-src: Removal of this python2 module
- python-optional-src was not getting built anyway as it was not listed
in make.sh
- lfs file was missing most of the standard content. No source info
and no build instructions
- missing source file from IPFire source system
- grep on build/ found no dependencies on this module
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org> Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>