Inline read_next_argument() into peas_method_apply_valist()
Inline read_next_argument() into peas_method_apply_valist()

The reason is that va_list* passing is not supported and doesn't work
on some platforms (most notably x86-64). So we basically need to do all
the va_arg() calls from the same function.

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