GdkPixbuf 2.42.4 (stable)

List of changes since 2.42.2
----------------------------

 - Make enum type registration thread safe
 - Do not install skipped test files [Jan Tojnar]
 - Fix GIF initialization [Simon McVittie]
 - Always run GIF loader tests [Simon McVittie]
 - Fix leaks discovered via ASan [Simon McVittie]
 - Expose GdkPixbufLoader API via introspection [Paolo Borelli]
 - Fix revert-to-previous first frame behaviour for GIF files [Robert Ancell, #166]
 - Link to libintl if needed [Fabrice Fontaine]
 - Improve support for using gdk-pixbuf as a subproject [Xavier Claessens]
 - Fix build with GModule disabled [Fabrice Fontaine]
 - Use gi-docgen to generate the API reference from introspection data
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