Method declared but never defined nor used.

Change-Id: I3990822cfe202b8537a7c9ad58a61c55bc2e3e82

sc/source/core/opencl/formulagroupcl.cxx

@@ -3183,7 +3183,7 @@ public:
     cl_mem GetResultBuffer(void) const { return mpResClmem; }
 
 private:
-    void TraverseAST(FormulaTreeNodeRef);
+
     FormulaTreeNodeRef mpRoot;
     SymbolTable mSyms;
     std::string mKernelSignature, mKernelHash;