Cross bootstrap!

[Ludovic Courtès]

Hello!

As of commit 5708485, I have successfully cross-built the 5 tarballs of
bootstrap binaries (Coreutils & co., GCC, libc, Binutils, and Guile) for
mips64el-linux-gnu (N32).

That means that we can cross-build them for any GNU/Linux architecture
supported by the tool chain.  This will make porting the distro to new
architectures much easier.

The mips64el-linux-gnu binaries (shortly available from
<http://hydra.gnu.org/jobset/gnu/core-updates>) appear to work, except
perhaps for Guile, which aborts at startup.  However, I haven’t been
able to debug it, because strace there displays the syscall names, but
not their arguments.

Anyway, our first target will be mips64el-linux-gnu/N64 so that’s what
we should focus on now.  Perhaps armel will come next?  :-)

Ludo’.