SignalDelegator: Move virtual destructor to base class

Ensures that destruction behavior will always handle the polymorphic
case, no matter where it occurs in the hierarchy.

External/FEXCore/include/FEXCore/Core/SignalDelegator.h

@@ -30,6 +30,8 @@ namespace Core {
 
   class SignalDelegator {
   public:
+    virtual ~SignalDelegator() = default;
+
     /**
      * @brief Registers an emulated thread's object to a TLS object
      *

Source/Tests/LinuxSyscalls/SignalDelegator.h

@@ -30,7 +30,7 @@ namespace FEX::HLE {
     // Returns true if the host handled the signal
     // Arguments are the same as sigaction handler
     SignalDelegator();
-    virtual ~SignalDelegator();
+    ~SignalDelegator() override;
 
     /**
      * @brief Registers an emulated thread's object to a TLS object