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()

ctl/shared_ptr.h

@@ -335,6 +335,7 @@ class shared_ptr
         return p;
     }
 
+#if 0 // TODO(mrdomino): find a different way
     template<typename U>
     bool owner_before(const shared_ptr<U>& r) const noexcept
     {
@@ -346,6 +347,7 @@ class shared_ptr
     {
         return !r.owner_before(*this);
     }
+#endif
 
   private:
     template<typename U>