The template files in the `build-aux` directory used in enums sources
and headers generation use the `{$name}-template.[ch]` pattern.
However, the examples in the official guide[0] and usually GNOME and
Freedesktop packages use the `{$name}.[ch].template` pattern.
Due to this, the name of the template files and build commands have
been changed.
[0] https://developer.gnome.org/gobject/stable/glib-mkenums.html
The code to handle the Enums and Flags type information is automatically built
with `glib-mkenums' and the new templates kept under `build-aux'.
Note: We currently skip the type information of `MMModemBand'. GFlagsValue
can hold only 32-bit types, and we're working with a 64-bit flag here.
See: https://bugzilla.gnome.org/show_bug.cgi?id=663054