gnu: glibc/hurd: Add unsubmitted getauxval patch from upstream....This support building of gdk-pixbuf, gobject-introspection.
* gnu/packages/patches/glibc-hurd-getauxval.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/base.scm (glibc/hurd)[source]: Use it.