message: Explicitly default CStringView copy-assignment
  This is good form, since the class has a user-declared copy constructor.
  Without this, clang emits the following warning:
  warning: definition of implicit copy assignment operator for 'CStringView'
  is deprecated because it has a user-declared copy constructor [-Wdeprecated-copy]
diff: @@ -12,6 +12,8 @@ namespace vcpkg
  constexpr CStringView(const CStringView&) = default;
  CStringView(const std::string& str) : cstr(str.c_str()) { }
  + CStringView& operator=(const CStringView& cstr) = default;
  +
  constexpr const char* c_str() const { return cstr; }
  void to_string(std::string& str) const { str.append(cstr); }
  