Add a virtual destructor for the LauncherSignal base class

Move qDeleteAll into cpp file, as LauncherSignal is defined there.

Change-Id: I59ed1de2025c3f62196e1c676accf26b3fb813ac
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/launchersocket.cpp

@@ -41,6 +41,7 @@ class LauncherSignal
 {
 public:
     CallerHandle::SignalType signalType() const { return m_signalType; }
+    virtual ~LauncherSignal() = default;
 protected:
     LauncherSignal(CallerHandle::SignalType signalType) : m_signalType(signalType) {}
 private:
@@ -105,6 +106,11 @@ private:
     const int m_exitCode;
 };
 
+CallerHandle::~CallerHandle()
+{
+    qDeleteAll(m_signals);
+}
+
 bool CallerHandle::waitForStarted(int msecs)
 {
     return waitForSignal(msecs, SignalType::Started);