* gnu/packages/patches/libgpg-error-hurd64.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/gnupg.scm (libgpg-error)[arguments]: Use it when building for
the 64bit Hurd.
Change-Id: Icabb7cd7bb5bcc771ccee5b8a7f57f52b9b58183