error out on trying to compile USER-INTEL with -DLAMMPS_BIGBIG

src/USER-INTEL/fix_intel.cpp

@@ -34,6 +34,10 @@
 #include <stdio.h>
 #include <math.h>
 
+#ifdef LAMMPS_BIGBIG
+#error "The USER-INTEL package is not compatible with -DLAMMPS_BIGBIG"
+#endif
+
 #ifdef _LMP_INTEL_OFFLOAD
 #ifndef INTEL_OFFLOAD_NOAFFINITY
 #include <unistd.h>