Merge pull request #42263 from apple/egorzhdan/libstdcxx-old-std-fix

[cxx-interop] Fix test failures with older libstdc++

Author: egorzhdan

stdlib/public/Cxx/libstdcxx.h

@@ -50,11 +50,30 @@
 #include <type_traits>
 #include <unordered_map>
 #include <unordered_set>
+
+// C++17 and newer:
+
+#if __has_include(<any>)
 #include <any>
+#endif
+#if __has_include(<charconv>)
 #include <charconv>
+#endif
+#if __has_include(<execution>)
 #include <execution>
+#endif
+#if __has_include(<filesystem>)
 #include <filesystem>
+#endif
+#if __has_include(<memory_resource>)
 #include <memory_resource>
+#endif
+#if __has_include(<optional>)
 #include <optional>
+#endif
+#if __has_include(<string_view>)
 #include <string_view>
+#endif
+#if __has_include(<variant>)
 #include <variant>
+#endif