Log Message:
glib2: Update devel/glib2 to 2.68.2

Overview of changes in GLib 2.68.2

- Fix building third-party projects against GLib on CentOS 7 (work by
Ignacio Casal Quinteiro) (#2387)

Bugs fixed:
- #2387 json-glib does not build with glib 2.68.1
- !2060 gmacros: check that __cplusplus or _MSC_VER is defined
- !2068 gmacros: missing check if STDC_VERSION is defined
- !2079 Backport !2078 “gthreadedresolver: don't ignore flags in \ 
lookup_by_name_with_flags” to glib-2-68

Translation updates:

- Nepali
- Serbian