2.37.7 (unstable):

Gio:
* Menu: Add insert/append/prepend_section() with no label parameter.
  (Murray Cumming) Bug #702456 (Aurimas ÄŒernius)
    
gmmproc:
* Pass NULL to C function calls for optional empty strings.
  (José Alburquerque) Bug #686909. Bug #702456
* Add parameter return_value in _WRAP_VFUNC.
  (Marcin Kolny) Bug #705699.
    
Build:
* Update Visual Studio Projects
  (Chun-wei Fan)