AthenaKernel: Fix compilation with gcc11.

    
Can't use full template-id to name a destructor.

Control/AthenaKernel/AthenaKernel/CondCont.icc

@@ -212,7 +212,7 @@ CondCont<T>::CondCont (Athena::IRCUSvc& rcusvc,
  * @brief Destructor.
  */
 template <typename T>
-CondCont<T>::~CondCont<T>()
+CondCont<T>::~CondCont()
 {
 }    
 
@@ -409,7 +409,7 @@ bool CondContMixedBase::valid (const EventIDBase& t) const
  * @brief Destructor.
  */
 template <typename T>
-CondContMixed<T>::~CondContMixed<T>()
+CondContMixed<T>::~CondContMixed()
 {
 }    
 

Control/AthenaKernel/AthenaKernel/MetaCont.h

@@ -104,7 +104,7 @@ namespace SG {
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 template <typename T>
-MetaCont<T>::~MetaCont<T>() {
+MetaCont<T>::~MetaCont() {
   for (auto t : m_metaSet) {
     delete t.second;
   }