generated kernel config files: makeconf removes too much

src/sys/arch/atari/conf/makeconf reads GENERIC.in etc. and writes a few 
files from that. Unfortunately it removes a few lines too much in that 
process, e.g. lines like

 	#pseudo-device  gre             2       # generic L3 over IP tunnel

in GENERIC.in get stripped completely, while they should probably left in 
verbatime in the generated kernel config files.

I'd appreciate if someone could fix that.

  - Hubert