debugger: use target-async/exec-interrupt for remote debugging

This seems to be the only way to make the setup work on Windows at all.

Change-Id: Ib70c8422dceea84ae5cc9e671de977de0887c80e
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/gdb/gdbengine.h

@@ -732,6 +732,8 @@ private: ////////// View & Data Stuff //////////
     BreakpointResponseId m_qFatalBreakpointResponseId;
     bool m_actingOnExpectedStop;
 
+    bool usesExecInterrupt() const;
+
     QHash<int, QByteArray> m_scheduledTestResponses;
     QSet<int> m_testCases;
 };