Update text about ports, hopefully not too controversial.

[u/mdw/putty] / .cvsignore

*.pdb *.ilk *.res *.RES *.pch *.rsp *.obj *.exe *.ncb *.plg *.dsw *.opt *.dsp
*.tds *.map
Makefile.bor Makefile.cyg Makefile.vc