[AppStream] AppStreamGlib 0.7.9

[Richard Hughes]

Version 0.7.9
~~~~~~~~~~~~~~
Released: 2018-06-04

New Features:
 - Add ability to store signature filename and checksum (Richard Hughes)
 - Convert local icons found in metainfo files (Richard Hughes)

Bugfixes:
 - Follow the Debian tilde usage when ordering versions (Richard Hughes)
 - Remove the refcounted string interning feature (Richard Hughes)
 - Use the launchable to find the desktop filename (Richard Hughes)

Richard.