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b0575dc5 - Makefile.in.in: Add an option to claim the package as GNU/non-GNU

Makefile.in.in: Add an option to claim the package as GNU/non-GNU Reporeted by David Shea at: <https://savannah.gnu.org/bugs/?40520>. * Makevars (PACKAGE_GNU): New variable. * Makefile.in.in ($(DOMAIN).pot-update): Don't search for "GNU packagename" if $(PACKAGE_GNU) is set.