gcc packages to build biarch compilers

[Matthias Klose <doko@cs.tu-berlin.de>]

On http://people.debian.org/~doko/gcc-3.[34] you find packages with a
setup to build biarch compilers on powerpc (which needs a 64bit glibc
as a build dependency).

- gcc-3.3: added a patch to build from the hammer branch (3.3.4). This
  works on i386, fails on amd64, powerpc unknown. edit
  debian/rules.defs (hammer_branch).

- gcc-3.4: edit debian/rules.defs (powerpc64_build)

In both cases a patch like debian/patches/sparc-config-ml is still
needed.

Thanks for any feedback.