docs/reference/meson.build: Update for Doxygen >= 1.8.16
docs/reference/meson.build: Update for Doxygen >= 1.8.16

Doxygen 1.8.16 and later does not store tag file names in the html files.
This requires changes in meson.build and in doc-install.pl (in mm-common).
Otherwise references to other modules won't be updated in the html files
when they are installed.

GNOME/gtkmm,GNOME/gtkmm,GNOME/gtkmm,GNOME/gtkmm