Fix missing typedef in enum declaration.
Fix missing typedef in enum declaration.

Distrotech/libpeas,Distrotech/libpeas,gregier/libpeas,Distrotech/libpeas,gregier/libpeas,GNOME/libpeas,chergert/libpeas,chergert/libpeas,gregier/libpeas,chergert/libpeas,GNOME/libpeas,gregier/libpeas