[Bug 263454] graphics/cairo: Fix build with upcoming autoconf 2.71

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 21 Apr 2022 16:36:39 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263454

--- Comment #4 from Tobias C. Berner <tcberner@freebsd.org> ---
lgtm

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