Fold LIBC_UNICODE into LIBC_STR

libc/str/unicode-properties.txt

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+Lu = Letter, uppercase
+Ll = Letter, lowercase
+Lt = Letter, titlecase
+Lm = Letter, modifier
+Lo = Letter, other
+Mn = Mark, nonspacing
+Mc = Mark, spacing combining
+Me = Mark, enclosing
+Nd = Number, decimal digit
+Nl = Number, letter
+No = Number, other
+Pc = Punctuation, connector
+Pd = Punctuation, dash
+Ps = Punctuation, open
+Pe = Punctuation, close
+Pi = Punctuation, initial quote (may behave like Ps or Pe depending on usage)
+Pf = Punctuation, final quote (may behave like Ps or Pe depending on usage)
+Po = Punctuation, other
+Sm = Symbol, math
+Sc = Symbol, currency
+Sk = Symbol, modifier
+So = Symbol, other
+Zs = Separator, space
+Zl = Separator, line
+Zp = Separator, paragraph
+Cc = Other, control
+Cf = Other, format
+Cs = Other, surrogate
+Co = Other, private use
+Cn = Other, not assigned (including noncharacters)
+
+W  Wide      Naturally wide character, e.g. Hiragana.
+Na Narrow    Naturally narrow character, e.g. ISO Basic Latin alphabet.
+F  Fullwidth Wide variant with compatibility normalisation to naturally narrow character, e.g. fullwidth Latin script.
+H  Halfwidth Narrow variant with compatibility normalisation to naturally wide character, e.g. half-width kana. Includes U+20A9 (₩) as an exception.
+A  Ambiguous Characters included in East Asian DBCS codes but also in European SBCS codes, e.g. Greek alphabet. Duospaced behaviour can consequently vary.
+N  Neutral   Characters which do not appear in East Asian DBCS codes, e.g. Devanagari.