errata - 5.1R

[Alexandre Michelot]

Hi,

I don't exactly where to post, sorry if it's the wrong person...
When installing the 5.1R on an old machine (k6-2), I encountered some 
problems due to a gcc regression producing segfault during compilation 
and eventually broken code when using : -march=k6-2 -O2

It may be usefull to warn the users in the errata.
I don't know if it is a known 'bug'.

I hope it will be helpfull.
Thanks for the great job !

-- 
	Alexandre.