Add missing #include <boost/exception/diagnostic_information.hpp>

[AdrianBunk]

This fixes the build failures at
https://buildd.debian.org/status/logs.php?pkg=gnss-sdr&ver=0.0.16-1%2Bb2

/<<PKGBUILDDIR>>/src/algorithms/signal_source/adapters/limesdr_signal_source.cc: In constructor ‘LimesdrSignalSource::LimesdrSignalSource(const ConfigurationInterface*, const string&, unsigned int, unsigned int, Concurrent_Queue<std::shared_ptr<pmt::pmt_base> >*)’:
/<<PKGBUILDDIR>>/src/algorithms/signal_source/adapters/limesdr_signal_source.cc:100:67: error: ‘diagnostic_information’ is not a member of ‘boost’
  100 |                     LOG(WARNING) << "Boost exception: " << boost::diagnostic_information(e);
      |                                                                   ^~~~~~~~~~~~~~~~~~~~~~

[carlesfernandez]

This fix is already in the next branch, but I'll accept this PR since the main branch should be always usable with the latest GNU Radio version. But this also means that we need to make a new release soon :-)

Thanks for your contribution.