[mythtv] OS X compile error

[Nigel Pearson]

> ld: Undefined symbols:
> SignalMonitorValue::Parse(QStringList const&)
> SignalMonitorValue::AllGood(std::vector<SignalMonitorValue, 
> std::allocator<SignalMonitorValue> > const&)
...
> I had some earlier issues with signalmonitor.cpp not being included in 
> the Makefile for the OS X build.  Any ideas on why that .cpp is not 
> included?

	New functionality added into the frontend (tv_play.cpp)
about 6 hours ago. The file's inclusion is conditional on
using_backend, when I think it should be either using_frontend,
or there all the time.

	Until Daniel sorts it out, add signalmonitorvalue.cpp
into SOURCES for macx.

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