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unigbrk/u*-grapheme-prev: Support Indic, Emojis, regional indicators.

Reported by Kang-Che Sung <explorer09@gmail.com> in
<https://lists.gnu.org/archive/html/bug-libunistring/2025-03/msg00000.html>.

* lib/unigbrk/u-grapheme-prev.h: New file, based on
lib/unigbrk/u-grapheme-breaks.h.
* lib/unigbrk/u8-grapheme-prev.c: Include unictype.h and
u-grapheme-prev.h.
(u8_grapheme_prev): Remove function.
* lib/unigbrk/u16-grapheme-prev.c: Include unictype.h and
u-grapheme-prev.h.
(u16_grapheme_prev): Remove function.
* lib/unigbrk/u32-grapheme-prev.c: Include unictype.h and
u-grapheme-prev.h.
(u32_grapheme_prev): Remove function.
* modules/unigbrk/u8-grapheme-prev (Files): Add
lib/unigbrk/u-grapheme-prev.h.
(Depends-on): Remove unigbrk/uc-is-grapheme-break. Add unigbrk/base,
unigbrk/uc-gbrk-prop, unictype/incb-of,
unictype/property-extended-pictographic, bool.
(configure.ac): Bump required libunistring version.
* modules/unigbrk/u16-grapheme-prev (Files): Add
lib/unigbrk/u-grapheme-prev.h.
(Depends-on): Remove unigbrk/uc-is-grapheme-break. Add unigbrk/base,
unigbrk/uc-gbrk-prop, unictype/incb-of,
unictype/property-extended-pictographic, bool.
(configure.ac): Bump required libunistring version.
* modules/unigbrk/u32-grapheme-prev (Files): Add
lib/unigbrk/u-grapheme-prev.h.
(Depends-on): Remove unigbrk/uc-is-grapheme-break. Add unigbrk/base,
unigbrk/uc-gbrk-prop, unictype/incb-of,
unictype/property-extended-pictographic, bool.
(configure.ac): Bump required libunistring version.
* tests/unigbrk/test-u8-grapheme-prev.c (main): Add more test cases,
from tests/unigbrk/test-u8-grapheme-breaks.c.
* tests/unigbrk/test-u16-grapheme-prev.c (main): Add more test cases,
from tests/unigbrk/test-u16-grapheme-breaks.c.
* tests/unigbrk/test-u32-grapheme-prev.c (main): Add more test cases,
from tests/unigbrk/test-u32-grapheme-breaks.c.
kc3-lang/gnulib/modules/unigbrk/u32-grapheme-prev

Commit

modules/unigbrk/u32-grapheme-prev
