textproc/unistring: Update to 1.0

Despite the momentous version number, this is a fairly minor update.
There is no shlib major bump.

Upstream chagnes:

    The license has changed from "LGPLv3+ or GPLv2" to "LGPLv3+ or GPLv2+".

    The data tables and algorithms have been updated to Unicode version 14.0.0.

    The functions u8_uctomb, u16_uctomb, u32_uctomb now support
    strings larger than 2 GiB by taking an 'n' argument of type
    ptrdiff_t (instead of int).

    The functions u*_possible_linebreaks and u*_width_linebreaks now
    make it easier to work with strings that contain CR-LF sequences:
    In this case, in the returned array, it will return
    UC_BREAK_CR_BEFORE_LF followed by UC_BREAK_MANDATORY (instead of
    twice UC_BREAK_MANDATORY).

    There are new properties for recognizing pictographic symbols and regional indicators:

    - UC_PROPERTY_EMOJI                  uc_is_property_emoji
    - UC_PROPERTY_EMOJI_PRESENTATION    uc_is_property_emoji_presentation
    - UC_PROPERTY_EMOJI_MODIFIER        uc_is_property_emoji_modifier
    - UC_PROPERTY_EMOJI_MODIFIER_BASE    uc_is_property_emoji_modifier_base
    - UC_PROPERTY_EMOJI_COMPONENT        uc_is_property_emoji_component
    - UC_PROPERTY_EXTENDED_PICTOGRAPHIC  uc_is_property_extended_pictographic
    - UC_PROPERTY_REGIONAL_INDICATOR    uc_is_property_regional_indicator

    Fixed multithread-safety bugs on Cygwin, native Windows, and Haiku.

(gdt)