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glib/gvariant: use g_utf8_validate() for strlen

Christian Hergert requested to merge wip/chergert/use-utf8-validate-for-strlen into main

We can get the length of the string if we provide an out argument to g_utf8_validate(). This avoids an extra strlen() when creating GVariant for UTF-8 strings.

This is good for nearly 7% reduction of CPU samples when building heavily string-based GVariant using GVariantBuilder as a benchmark.

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