[glib] (4 commits) Non-fast-forward update to branch add-g-has-typeof-1440

[Iain Lane <iainl src gnome org>]

The branch 'add-g-has-typeof-1440' 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:

  35bb1f7... gmacros: Add new private g_has_typeof to abstract __typeof_

Commits added to the branch:

  747c2f5... gobject: Make g_clear_object take a non-volatile GObject ** (*)
  0da6265... gmem.h: Use __typeof__() in the g_clear_pointer() macro (*)
  08f41d8... Merge branch 'type-safe-g-clear-pointer-1425' into 'master' (*)
  a749643... gmacros: Add new private g_has_typeof to abstract __typeof_

(*) This commit already existed in another branch; no separate mail sent