The man pages don't change very often, but draw in both docbook and
asciidoc. The latter is particularly problematic, as some distros
still ship only a python2 version of the tool.
Address this by generating the man pages at dist time, and including
the result in the tarball.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1553>
This is what most GNOME modules now use instead of a shell script,
which makes sense given that the build system itself is written
in python.
This particular copy comes from nautilus ...
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/920
Package managers usually take care of compiling GSettings schemas and
updating the .desktop database on installation, but when building
manually from source, we should perform the aforementioned actions
ourselves.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/127