Doc Extractor: Correct the logic of the --no-since option.
Doc Extractor: Correct the logic of the --no-since option.

	* codegen/docextract.py (process_final_sections): If the --no-since
	option has been specified and a "Since:" is encountered during the
	processing of the final sections, simply don't append the "Since: ..."
	instead of reading the next line.  This preserves the logical flow of
	processing.

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