Overview of changes in GLib 2.43.90
===================================

* new GSimpleIOStream class to construct a GIOStream from an arbitrary
  GInputStream and GOutputStream

* GApplication: new API for marking 'busy' state according to the value
  of a boolean property on another object

* GOptionGroup: add binding support (boxed type, annotation fixes, etc.)

Bugs fixed:
 739724 Test functions should have async scope
 741024 glist: Mention that g_list_length() is bad for checking list emptiness
 741630 Add GSimpleIOStream class
 743349 goption: Add boxed type for GOptionGroup
 743990 GDBus connection closing is broken
 744565 gapplication: add bind_busy_property()

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