New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/17766#issuecomment-576313504

Comment:
I think those modules are plugins to glade's designed tools.

Our libxfce4ui is depended on libglade3ui because we're shipping a glade3's plugin with xfce:

```
$ xbps-query -Rf libxfce4ui | grep glade
/usr/lib/glade/modules/libxfce4uiglade2.so
/usr/share/glade/catalogs/libxfce4ui-2.xml
/usr/share/glade/pixmaps/hicolor/16x16/actions/widget-libxfce4ui-xfce-titled-dialog.png
/usr/share/glade/pixmaps/hicolor/22x22/actions/widget-libxfce4ui-xfce-titled-dialog.png
```

From libxfce4ui's configure:
```
$ ./configure --help
  --with-gladeui-catalogdir=PATH
                          Specify where to install glade designer catalog
                          files (default=autodetect)
  --with-gladeui-moduledir=PATH
                          Specify where to install glade designer modules
                          (default=autodetect)
  --with-gladeui-pixmapdir=PATH
                          Specify where to install glade designer pixmaps
                          (default=autodetect)
  --with-gladeui2-catalogdir=PATH
                          Specify where to install glade 3.0 designer catalog
                          files (default=autodetect)
  --with-gladeui2-moduledir=PATH
                          Specify where to install glade 3.0 designer modules
                          (default=autodetect)
  --with-gladeui2-pixmapdir=PATH
                          Specify where to install glade 3.0 designer pixmaps
                          (default=autodetect)
```
and configure.ac
```
dnl *********************************************************
dnl *** Optional support for the Glade Interface Designer ***
dnl *********************************************************
dnl Do not try to build gladeui when gtk2 is disabled
```

I think all modules are optional plugins to glade,
and we should split those plugins out of our libxfce4ui