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/SyntaxHighlighter.h

@@ -6,11 +6,12 @@
 
 #pragma once
 
+#include <LibJS/Forward.h>
 #include <LibSyntax/Highlighter.h>
 
 namespace JS {
 
-class SyntaxHighlighter : public Syntax::Highlighter {
+class JS_API SyntaxHighlighter : public Syntax::Highlighter {
 public:
     SyntaxHighlighter() = default;
     virtual ~SyntaxHighlighter() override = default;