* gnu/packages/patches/p11-kit-hurd.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/tls.scm (p11-kit)[native-inputs]: Add autoconf, automake,
gettext and libtool when targeting Hurd.
[inputs]: Add libbsd and hurd-patch when targeting hurd.
[arguments]: Add 'apply-hurd-patch and 'bootstrap phases when targeting Hurd.