debugger: Make "set breakpoint of qFatal" optional

This is mainly a workaround for cases where gdb crashes when setting
this breakpoint. It's unclear so far why this happens, but when it
happens, the debugger is basically useless, so there should be a
way to disable the "bad" feature.

Change-Id: I28ede9b38eb8bf56a8c5998088be487b4ee5896d
Reviewed-by: con
Task-number: QTCREATORBUG-5275
Reviewed-on: http://codereview.qt.nokia.com/1604
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/debugger/gdb/gdboptionspage.cpp

@@ -96,6 +96,8 @@ QWidget *GdbOptionsPage::createPage(QWidget *parent)
         m_ui->checkBoxAdjustBreakpointLocations);
     m_group.insert(debuggerCore()->action(BreakOnWarning),
         m_ui->checkBoxBreakOnWarning);
+    m_group.insert(debuggerCore()->action(BreakOnFatal),
+        m_ui->checkBoxBreakOnFatal);
     m_group.insert(debuggerCore()->action(GdbWatchdogTimeout),
         m_ui->spinBoxGdbWatchdogTimeout);