LibJS: Enable EXPLICIT_SYMBOL_EXPORT

Author: https://github.com/ayeteadoe
Commit: c14173f651
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5215
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibJS/Runtime/Reference.h

@@ -15,7 +15,7 @@ namespace JS {
 
 Reference make_private_reference(VM&, Value base_value, FlyString const& private_identifier);
 
-class Reference {
+class JS_API Reference {
 public:
     enum class BaseType : u8 {
         Unresolvable,