[glib] (5 commits) Non-fast-forward update to branch wip/smcv/deprecated-prop-followup

[Simon McVittie <smcv src gnome org>]

The branch 'wip/smcv/deprecated-prop-followup' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  8d9ff4f... Move common test environment variables to top level
  720e4f3... tests: Disable deprecation warnings where necessary
  28349f0... Run all tests with deprecated property warnings enabled

Commits added to the branch:

  88e160d... tests: Move common test environment variables to top level
  25d21ed... gio/tests: Disable deprecation warnings where necessary
  0bba27e... gobject/tests: Exercise a floating object reaching last-unr
  7254fd7... gobject/tests: Don't unref a floating object reference by m
  831f5c5... tests: Run all tests with deprecated property warnings enab