#626 not replace variables in documents

[HAT]

The variables in documents is not replaced with.
Why?

$ ./configure --with-docbook=/usr/share/sgml/docbook/xsl-stylesheets-1.78.1
$ make
$ make html

$ sudo make install

$ man afpd
...
FILES
@pkgconfdir@/afp.conf
configuration file used by afpd

   ${prefix}/var/netatalk/afp_signature.conf
       list of server signature

   ${prefix}/var/netatalk/afp_voluuid.conf
       list of UUID for Time Machine volume

   @pkgconfdir@/extmap.conf
       file name extension mapping

   @pkgconfdir@/msg/message.pid
       contains messages to be sent to users.

[Daniel Markstedt]

This is not isolated to the afpd man page. It affects at least half a dozen pages.

[Daniel Markstedt]

Bug migrated to github for tracking https://github.com/Netatalk/netatalk/issues/383