* gnu/packages/hurd.scm (hurd-headers): Do it. Also backport some patches to
make it build, and remove older patches. Also stop pretending we're on
i586-pc-gnu.
(hurd): Remove unneeded patches.
* gnu/packages/patches/hurd-add-without-rump-configure-option.patch:
* gnu/packages/patches/hurd-fix-types-of-read-write-and-readables-methods-2.patch:
* gnu/packages/patches/hurd-fix-types-of-read-write-and-readables-methods.patch:
New files.
* gnu/packages/patches/hurd-cross.patch:
* gnu/packages/patches/hurd-xattr.patch: Delete files.
* gnu/local.mk (dist_patch_DATA): Register and unregister them.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>