[Bug 272311] graphics/exiv2: upgrade to v0.28

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272311

--- Comment #58 from Matthias Andree <mandree at FreeBSD.org> ---
(In reply to Alexey Dokuchaev from comment #57)
No they don't. This is the relevant header diff between 0.27 and 0.28, and they
also assume C++17...

-        std::string toString() const;
-        std::string toString(long n) const;
-        long toLong(long n =0) const;
-        float toFloat(long n =0) const;
-        Rational toRational(long n =0) const;
-        Value::AutoPtr getValue() const;
-        const Value& value() const;
+  [[nodiscard]] std::string toString() const override;
+  [[nodiscard]] std::string toString(size_t n) const override;
+  [[nodiscard]] int64_t toInt64(size_t n = 0) const override;
+  [[nodiscard]] float toFloat(size_t n = 0) const override;
+  [[nodiscard]] Rational toRational(size_t n = 0) const override;
+  [[nodiscard]] Value::UniquePtr getValue() const override;
+  [[nodiscard]] const Value& value() const override;

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