The xmlto error[1] was due to libsepol using an unversioned PUBLIC identifier
for DocBook 4.2.
[1]: <https://pagure.io/xmlto/blob/6fa6a0e07644f20abf2596f78a60112713e11cbe/f/FAQ>
* gnu/packages/patches/libsepol-versioned-docbook.patch: New file.
* gnu/local.mk: Register it.
* gnu/packages/selinux.scm (libsepol)[source]: Apply it.
(secilc)[arguments]: Drop xmlto workaround.
[native-inputs]: Add docbook-xml-4.2.
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Change-Id: I152dd7a30b2a310ed6589133bc98f5eef8a190a1
