The design of po4a seems to expect it to act as a build system,
running with a config file telling it which files to build. In
version 0.68-1, the po4a-gettextize tool has changed to error out
with a comment that it's not being run the way it expects.
See https://bugs.debian.org/1020821
po4a-updatepo works for now with 0.68-1, although it prints a deprecation
message.
This is intended to allow xgettext to extract plural forms from the code
without actually altering the input. Basically, this is to _n() as N_()
is to _(), and doesn't actually call any gettext functions.
Without this, rebuilding the game manuals fails because
/usr/share/asciidoc/docbook-xsl/xhtml.xsl doesn't exist. We need to use
/etc/asciidoc/docbook-xsl/xhtml.xsl instead here.
