Add missing include

Change-Id: Iadcb0b2cbef90b1794e283fbfc2559c913633af7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggerplugin.cpp

@@ -108,6 +108,7 @@
 #include <utils/statuslabel.h>
 #include <utils/winutils.h>
 
+#include <QApplication>
 #include <QCheckBox>
 #include <QComboBox>
 #include <QDockWidget>