no need to offset arg positions when is_method is true
no need to offset arg positions when is_method is true

* The old GI libraries required we offset arg positions for the missing
  self argument.  The new library fixes this so we don't have to offset
  anymore.

https://bugzilla.gnome.org/show_bug.cgi?id=629087

MathieuDuponchelle/pygobject,GNOME/pygobject,nzjrs/pygobject,jdahlin/pygobject,MathieuDuponchelle/pygobject,davibe/pygobject,davibe/pygobject,jdahlin/pygobject,Distrotech/pygobject,thiblahute/pygobject,pexip/pygobject,davidmalcolm/pygobject,alexef/pygobject,davidmalcolm/pygobject,davidmalcolm/pygobject,Distrotech/pygobject,thiblahute/pygobject,choeger/pygobject-cmake,choeger/pygobject-cmake,GNOME/pygobject,thiblahute/pygobject,pexip/pygobject,pexip/pygobject,alexef/pygobject,jdahlin/pygobject,sfeltman/pygobject,nzjrs/pygobject,alexef/pygobject,Distrotech/pygobject,nzjrs/pygobject,GNOME/pygobject,davibe/pygobject,choeger/pygobject-cmake,sfeltman/pygobject,davibe/pygobject,Distrotech/pygobject,sfeltman/pygobject,MathieuDuponchelle/pygobject