BR: docbook-dtd412-xml, gettext-devel by cleanbuild

gettext-devel -- configure:3112: error: possibly undefined macro: AM_NLS
docbook-dtd412-xml -- ../mate-desktop-docs.sgml:3: warning: failed to load external entity "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"
gsettings-desktop-schemas-devel may be superfluous !