Replace the five Unknown stubs whose NIDs hash these ICU names with the
uchar.cpp definitions of ICU 78.1 (049e0d6a), over the Zs, Zl, Zp and
White_Space code points that ICU 65.1 to 78.1 ship. Values outside
U+0000..U+10FFFF return 0, as ICU's trie error value gives.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
