Update py-gobject3 to 3.24.1

3.24.1  10-Apr-2017
- pygi-info: initialize GIArgument before passing it to g_constant_info_get_value (Christoph Reiter) (#772949)
- configure.ac: post-release version bump to 3.24.1 (Christoph Reiter)

3.24.0  20-Mar-2017
- configure.ac: pre-release version bump to 3.24.0 (Christoph Reiter)

3.23.92 13-Mar-2017
- overrides: Update for Gdk-4.0 and Gtk+-4.0 (Fabian Orccon) (#777680)
- Disable -Werror=missing-prototypes (Christoph Reiter) (#777534)
- Fix new PEP8 errors (Christoph Reiter) (#776009)
- Move pep8/pyflakes tests from 'make check' to 'make check.quality' (Christoph Reiter) (#764087)
- overrides: Update for Gtk-4.0 (Christoph Reiter) (#773315)
- Handle exception unreffing Variant at exit (Dan Nicholson) (#776092)
- Handle multiple deinit of callable cache (Dan Nicholson) (#776092)
- configure.ac: post-release version bump to 3.23.0 (Christoph Reiter)

(prlw1)