Bug#852549: do not list /usr/lib/x86_64-linux-gnu/gio/modules

[cgzones]

Package: libglib2.0-0
Version: 2.50.2-2

cruft creates a report regarding this package:

---- missing: dpkg ----
       /usr/lib/x86_64-linux-gnu/gio
       /usr/lib/x86_64-linux-gnu/gio/modules

This is due to libglib2.0-0 lists this directory and file but does not
ship it by default.
The postinst script contains the following comment:

# The /usr/lib/gio/modules directory is no longer shipped by
# libglib2.0 itself so we need to check to avoid a warning from
# gio-querymodules