Properly export ucm_instantiate in UCOM libraries

This relates to Bug 1780

src/tools/qcom_p.h

@@ -318,7 +318,7 @@ public:		   \
 		Q_EXTERN_C __declspec(dllexport) \
                 const char * __stdcall qt_ucm_query_verification_data() \
                 { return qt_ucm_verification_data; } \
-		Q_EXTERN_C __declspec(dllexport) QUnknownInterface* \
+		Q_EXTERN_C Q_EXPORT __declspec(dllexport) QUnknownInterface* \
                 __stdcall ucm_instantiate()
 #	else
 #	    define Q_EXPORT_COMPONENT() \
@@ -326,7 +326,7 @@ public:		   \
 		Q_EXTERN_C __declspec(dllexport) \
                 const char *qt_ucm_query_verification_data() \
                 { return qt_ucm_verification_data; } \
-		Q_EXTERN_C __declspec(dllexport) QUnknownInterface* ucm_instantiate()
+		Q_EXTERN_C Q_EXPORT __declspec(dllexport) QUnknownInterface* ucm_instantiate()
 #	endif
 #    else
 #	define Q_EXPORT_COMPONENT() \
@@ -334,7 +334,7 @@ public:		   \
 	    Q_EXTERN_C \
             const char *qt_ucm_query_verification_data() \
             { return qt_ucm_verification_data; } \
-	    Q_EXTERN_C QUnknownInterface* ucm_instantiate()
+	    Q_EXTERN_C Q_EXPORT QUnknownInterface* ucm_instantiate()
 #    endif
 #    define Q_EXPORT_INTERFACE() Q_EXPORT_COMPONENT()
 #endif