* lib/gen-uni-tables.c: Add shell commands for creating
tests/unilbrk/LineBreakTest.txt.
* tests/unilbrk/LineBreakTest.txt: New file, from unicode.org.
* tests/unilbrk/test-uc-possible-linebreaks.c: New file, based on
tests/uniwbrk/test-uc-wordbreaks.c.
* tests/unilbrk/test-uc-possible-linebreaks.sh: New file, based on
tests/uniwbrk/test-uc-wordbreaks.sh.
* modules/unilbrk/u32-possible-linebreaks-tests (Files): Add them.
(Makefile.am): Arrange to compile test-uc-possible-linebreaks.c and test
test-uc-possible-linebreaks.sh.