When building libnice with glib fallback, its 'libgio_dep' internal
dependency doesn't provide all needed include and library search paths.
To avoid unresolved header files and linker errors in such case,
'libglib_dep', 'libmodule_dep' and 'libgobject_dep' from glib submodule
must be pulled in as well.
The problem should be fixed in GLib 2.60.