[Bug 272014] audio/festival: fix build with clang 16

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 16 Jun 2023 00:37:18 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272014

--- Comment #2 from Mikhail T. <mi@ALDAN.algebra.com> ---
Maybe, if we're manipulating CXXFLAGS anyway, add an explicit -std=gnu++11
instead? If only because we don't know, what else might be broken (subtly) by
the switch to 17?

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