Nim: Fix "overrides a member function but is not marked 'override'"

Change-Id: I248d8ca7381a80efa8c62c2e3028f92db9634fb7
Reviewed-by: hjk <hjk@qt.io>

src/plugins/nim/project/nimbuildsystem.h

@@ -58,7 +58,7 @@ public:
     void setExcludedFiles(const QStringList &list); // Keep for compatibility with Qt Creator 4.10
     QStringList excludedFiles(); // Make private when no longer supporting Qt Creator 4.10
 
-    void triggerParsing();
+    void triggerParsing() override;
 
     const Utils::FilePathList nimFiles() const;