Delete any pending signals in caller's destructor

Change-Id: I5b1ec32c64daf619cb0efabaf7d0688cefafd6c9
Reviewed-by: Artem Sokolovskii <artem.sokolovskii@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/launchersocket.h

@@ -68,6 +68,7 @@ public:
     };
     Q_ENUM(SignalType)
     CallerHandle(quintptr token, ProcessMode mode) : QObject(), m_token(token), m_processMode(mode) {}
+    ~CallerHandle() override { qDeleteAll(m_signals); }
 
     LauncherHandle *launcherHandle() const { return m_launcherHandle; }
     void setLauncherHandle(LauncherHandle *handle) { QMutexLocker locker(&m_mutex); m_launcherHandle = handle; }