configure.ac: allow disabling docbook
Sometimes we might want to build docs (install man pages, etc) but allow disabling use of docbook.
Bug: https://bugs.gentoo.org/310157 Signed-off-by: Sam James sam@gentoo.org
Sometimes we might want to build docs (install man pages, etc) but allow disabling use of docbook.
Bug: https://bugs.gentoo.org/310157 Signed-off-by: Sam James sam@gentoo.org