Remove obsolete IRIX 6.5 support

[Ian Lance Taylor]

Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> writes:

> * I'm removing IRIX-specific parts of libgo.  Given that libgo is
>   imported from upstream (and supposed to work or made work on the 4.7
>   branch), I don't know if this a good idea.

Yeah, it's not.  Just send me the mainline patches to libgo rather than
applying them yourself, I'll apply them to the upstream repository and
commit to mainline.

Thanks for working on this!

Ian