Make AX.25, DMR, P25, NXDN and FM selectable at compile time.

FMUpSampler.cpp

@@ -17,6 +17,10 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include "Config.h"
+
+#if defined(MODE_FM)
+
 #include "FMUpSampler.h"
 
 const uint32_t FM_UPSAMPLE_MASK = 0x00000FFFU;
@@ -94,4 +98,7 @@ uint16_t CFMUpSampler::getSpace() const
 {
   //return available space in bytes
   return m_samples.getSpace() * sizeof(TSamplePairPack);
-}
+}
+
+#endif
+