Make improvements

- wcsstr() is now linearly complex
- strstr16() is now linearly complex
- strstr() is now vectorized on aarch64 (10x)
- strstr() now uses KMP on pathological cases
- memmem() is now vectorized on aarch64 (10x)
- memmem() now uses KMP on pathological cases
- Disable shared_ptr::owner_before until fixed
- Make iswlower(), iswupper() consistent with glibc
- Remove figure space from iswspace() implementation
- Include line and paragraph separator in iswcntrl()
- Use Musl wcwidth(), iswalpha(), iswpunct(), towlower(), towupper()

third_party/musl/wctrans.c

@@ -0,0 +1,30 @@
+#include <wctype.h>
+#include <string.h>
+#include <locale.h>
+
+wctrans_t wctrans(const char *class)
+{
+	if (!strcmp(class, "toupper")) return (wctrans_t)1;
+	if (!strcmp(class, "tolower")) return (wctrans_t)2;
+	return 0;
+}
+
+wint_t towctrans(wint_t wc, wctrans_t trans)
+{
+	if (trans == (wctrans_t)1) return towupper(wc);
+	if (trans == (wctrans_t)2) return towlower(wc);
+	return wc;
+}
+
+wctrans_t __wctrans_l(const char *s, locale_t l)
+{
+	return wctrans(s);
+}
+
+wint_t __towctrans_l(wint_t c, wctrans_t t, locale_t l)
+{
+	return towctrans(c, t);
+}
+
+__weak_reference(__wctrans_l, wctrans_l);
+__weak_reference(__towctrans_l, towctrans_l);