[NFC] Use virtual keyword instead of override

Author: vepadulano

bindings/pyroot/cppyy/CPyCppyy/src/CPPMethod.h

@@ -24,8 +24,8 @@ class CPPMethod : public PyCallable {
 
 public:
     virtual PyObject* GetSignature(bool show_formalargs = true);
-    PyObject* GetSignatureNames() override;
-    PyObject* GetSignatureTypes() override;
+    virtual PyObject* GetSignatureNames();
+    virtual PyObject* GetSignatureTypes();
     virtual PyObject* GetPrototype(bool show_formalargs = true);
     virtual int       GetPriority();
     virtual bool IsGreedy();

bindings/pyroot/cppyy/CPyCppyy/src/CPPOverload.cxx

@@ -60,11 +60,11 @@ class TPythonCallback : public PyCallable {
     }
 
 
-    PyObject* GetSignatureNames() override {
+    virtual PyObject* GetSignatureNames() {
         return PyTuple_New(0);
     }
 
-    PyObject* GetSignatureTypes() override {
+    virtual PyObject* GetSignatureTypes() {
         return PyTuple_New(0);
     }