Revert "Debugger: simplify interrupting windows processes"

Ctrl+C events are only handled properly for console applications. When
gdb debugs a GUI application the CTRL+C events are not handled. This can
be even reproduced with a plain gdb started from CMD.

This partially reverts commit 9d88da6c2b
and 670b4ec729.

Fixes: QTCREATORBUG-31131
Change-Id: I11c9d9dc08b4dbe450f38e27559b130dd317b675
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggerruncontrol.cpp

@@ -276,6 +276,11 @@ void DebuggerRunTool::setSkipExecutableValidation(bool on)
     m_runParameters.skipExecutableValidation = on;
 }
 
+void DebuggerRunTool::setUseCtrlCStub(bool on)
+{
+    m_runParameters.useCtrlCStub = on;
+}
+
 void DebuggerRunTool::setBreakOnMain(bool on)
 {
     m_runParameters.breakOnMain = on;