build: Bump minimum glib version to 2.68.0
The following Merge Request (MR) has been forwarded from GitHub in order to prevent the GNOME Project from losing contributions coming from un-official channels. And for contributors to not see their valuable contributions not being accounted for.
Relevant information:
Github handle: h-c-mueller
MR URL: https://github.com/GNOME/gtk/pull/24
Patch URL: https://github.com/GNOME/gtk/pull/24.patch
Body of the MR:
Bump the glib requirement, since g_memdup2() is used.