Id: Fix MingW/gcc warning about exported inline function.

Change-Id: Ib80a0cdc1acc3eed893516e370045d4d7fcb3ee2
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/coreplugin/id.h

@@ -63,7 +63,7 @@ private:
     int m_id;
 };
 
-CORE_EXPORT inline uint qHash(const Id &id) { return id.uniqueIdentifier(); }
+inline uint qHash(const Id &id) { return id.uniqueIdentifier(); }
 
 } // namespace Core