[PATCH] Backport gettext fixes to get rid of warnings on macOS

[Tom Tromey]

>>>>> "Simon" == Simon Marchi <simon.marchi@ericsson.com> writes:

Simon> intl/ChangeLog:

Simon> 	* libgnuintl.h (_INTL_MAY_RETURN_STRING_ARG, gettext, dgettext,
Simon> 	dcgettext, ngettext, dngettext, dcngettext): Backport changes
Simon> 	from upstream gettext.

Thanks, I think you should check this in.

Tom