64-bit module support

[Ralf Baechle <ralf@linux-mips.org>]

I've added support for 64-bit modules in 2.4; the necessary patches for
modutils 2.4.21 and 2.4.27 can be found on ftp.linux-mips.org in
/pub/linux/mips/modutils/.

The 2.6 module code is a complete rewrite; it uses module-init-tools which
don't contain any architecture dependencies and therefore didn't need to
be changed; instead all the relocation business is done in the kernel
itself and those patches are already in CVS.

  Ralf