[core] allow also TRefProxy exec

to try to fix failing roottests

Author: ferdymercury

core/meta/src/TStreamerElement.cxx

@@ -31,6 +31,7 @@
 #include "TList.h"
 #include "TRef.h"
 #include "TRefArray.h"
+#include "TRefProxy.h"
 #include "TInterpreter.h"
 #include "TError.h"
 #include "TObjArray.h"
@@ -307,7 +308,7 @@ TClass *TStreamerElement::GetClassPointer() const
 Int_t TStreamerElement::GetExecID() const
 {
    TClass* const type = GetClassPointer();
-   if (!type || !(type->InheritsFrom(TRef::Class()) || type->InheritsFrom(TRefArray::Class()))) return 0;
+   if (!type || !(type->InheritsFrom(TRef::Class()) || type->InheritsFrom(TRefArray::Class()) || type->InheritsFrom(TRefProxy::Class()))) return 0;
 
    //if the UniqueID of this element has already been set, we assume
    //that it contains the exec id of a TRef object.