2.78.1 (stable):

Glib:
* Dispatcher: Allow destroy during emit
  (Kjell Ahlstedt) Issue #116 (PBS)

gmmproc:
* h2def.py: Make return types that are unsigned work.
  Required by gtkmm4, GdkDmabufTextureBuilder
  (Kjell Ahlstedt)

Build:
* Meson build: Don't fail if warning_level=everything
  (Daniel Boles, Kjell Ahlstedt) Merge request gtkmm!87
* MSVC, NMake: Make dep paths configurable
  (Chun-wei Fan)