Compile Windows.

src/libs/qmljs/qmljscodeformatter.h

@@ -71,8 +71,8 @@ protected:
     virtual void onEnter(int newState, int *indentDepth, int *savedIndentDepth) const = 0;
     virtual void adjustIndent(const QList<Token> &tokens, int lexerState, int *indentDepth) const = 0;
 
-    class State;
-    class BlockData
+    struct State;
+    class QMLJS_EXPORT BlockData
     {
     public:
         BlockData();