[HarfBuzz] Improvement for hb_buffer_guess_segment_properties()

[Konstantin Ritt]

Here is an implementation of
hb_language_get_default_for_script(hb_script_t) that could be used in
hb_buffer_guess_segment_properties() by default, when there is no language
set for a segment.

The values has been extracted from CLDR 22.1's likelySubtags.xml, and
adjusted manually.

regards,
Konstantin
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