Fix Xcode 16.3 build (#9422)

* Fix build with Xcode 16.3

* Simplify OpenVDB patch, from https://github.com/AcademySoftwareFoundation/openvdb/commit/930c3acb8e0c7c2f1373f3a70dc197f5d04dfe74#diff-bc3061cc2fe6c64a3d67c8350330bb3a530d01037faace6da27ad9a12aa03e29

* Fix CGAL header under clang 19
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281880

* Fix compile error due to removal of base template for `std::char_traits` in clang 19
https://releases.llvm.org/19.1.0/projects/libcxx/docs/ReleaseNotes.html#deprecations-and-removals

src/slic3r/GUI/WebGuideDialog.cpp

@@ -373,7 +373,7 @@ void GuideFrame::OnScriptMessage(wxWebViewEvent &evt)
     try {
         wxString strInput = evt.GetString();
         BOOST_LOG_TRIVIAL(trace) << "GuideFrame::OnScriptMessage;OnRecv:" << strInput.c_str();
-        json     j        = json::parse(strInput);
+        json     j        = json::parse(strInput.utf8_string());
 
         wxString strCmd = j["command"];
         BOOST_LOG_TRIVIAL(trace) << "GuideFrame::OnScriptMessage;Command:" << strCmd;