* gnu/packages/patches/hurd-64bit.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/hurd.scm (hurd)[source]: Use it.
[arguments]: When building for the 64bit Hurd, add "create-machine-symlink"
phase. In phases "build-libdde-linux" and "install-goodies", do not assume
x86, rather use actual ARCH, and follow upstream's "amd64" symlinking voodoo.
Change-Id: If264a91b2433add13f9121c482f0abe67ae5f1e9
