binutils snapshot builds

[Nick Clifton]

Hi Mark,

> Note that I changed the binutils, gdb and glibc snapshots to produce
> tar.xz files. Those are almost half of the tar.gz sized.
> 
> xz does use a bit more process/memory. It might be nice to use zstd
> instead. If zstd is common enough of course. What do people think?

Does tar automatically understand it ?  ie can I run:

   tar xvf <foo>.zst

and have it work ?  If so, then I would definitely think that
adding zstd support would be a good idea.

Cheers
   Nick