meson: Unbreak the non-macOS builds
meson: Unbreak the non-macOS builds

The name_suffix keyword argument identifies an empty array, not an
empty string, as None or null [1].  Using an empty string creates
shared objects without any suffix whatsoever on non-macOS
environments, which GModule can't load.

Fallout from 8d3367c2c500a8c9f67f0447c4f711ca89625ae4

[1] As per the implementation of the BuildTarget class in
meson/mesonbuild/build.py

https://gitlab.gnome.org/GNOME/glib-networking/issues/33

GNOME/glib-networking,GNOME/glib-networking,GNOME/glib-networking