flats: buildcfg: remove many duplicate entries (Sodaholic)
flats: buildcfg: remove many duplicate entries (Sodaholic)

This was a lot easier to do without having to worry about shareware!

Thanks to Sodaholic for reporting:
http://www.doomworld.com/vb/post/952575

Signed-off-by: RjY <83893d85028dba5ed7fb8142c08f77f1480bf584@users.sourceforge.net>

jmtd/freedoom,CWolfRU/freedoom,CWolfRU/freedoom,jmtd/freedoom,jmtd/freedoom