uniwidth/width: Fix width of U+1D173..U+1D17A.

uniwidth/width: Fix width of U+1D173..U+1D17A.

* lib/gen-uni-tables.c (is_nonspacing, output_nonspacing_property,
symbolic_width, output_width_property_test): New functions.
(main): Invoke output_nonspacing_property, output_width_property_test.
* lib/uniwidth/width.c (nonspacing_table_data): Set bits for
U+1D173..U+1D17A.
* tests/uniwidth/test-uc_width2.sh: For U+1D173..U+1D17A, expect 0, not
1.
* modules/uniwidth/*: Bump version number of expected libunistring
version.
* modules/unilbrk/*: Likewise.