LimeSDR input: correct compile errors

devices/limesdr/devicelimesdr.cpp

@@ -16,6 +16,7 @@
 
 #include <cstdio>
 #include <cstring>
+#include <cmath>
 #include "devicelimesdr.h"
 
 bool DeviceLimeSDR::setNCOFrequency(lms_device_t *device, bool dir_tx, std::size_t chan, bool enable, float frequency)

plugins/samplesource/limesdrinput/limesdrinput.cpp

@@ -279,7 +279,6 @@ bool LimeSDRInput::start()
     }
 
     m_limeSDRInputThread->setLog2Decimation(m_settings.m_log2SoftDecim);
-    m_limeSDRInputThread->setFcPos((int) m_settings.m_fcPos);
 
     m_limeSDRInputThread->startWork();