Disable some debugging code.

because linking issue due to `CPS_Instance` belongs to `xrEngine` and is not available to `xrCDB` due to source code organization

Author: drug007

src/xrCDB/ISpatial.cpp

@@ -283,13 +283,19 @@ void ISpatial_DB::insert(ISpatial* S)
             xrDebug::Fatal(DEBUG_INFO, "Invalid OBJECT position or radius (%s)", O->cName().c_str());
         else
         {
+#ifndef LINUX
             CPS_Instance* P = dynamic_cast<CPS_Instance*>(S);
             if (P)
                 xrDebug::Fatal(DEBUG_INFO, "Invalid PS spatial position{%3.2f,%3.2f,%3.2f} or radius{%3.2f}",
                     VPUSH(S->GetSpatialData().sphere.P), S->GetSpatialData().sphere.R);
             else
                 xrDebug::Fatal(DEBUG_INFO, "Invalid OTHER spatial position{%3.2f,%3.2f,%3.2f} or radius{%3.2f}",
                     VPUSH(S->GetSpatialData().sphere.P), S->GetSpatialData().sphere.R);
+#else
+            // In Linux there is a linking issue because `CPS_Instance` belongs to xrEngine
+            // and is not available to xrCDB due to source code organization
+            xrDebug::Fatal(DEBUG_INFO, "Invalid PS or other spatial position");
+#endif // ifndef LINUX
         }
     }
 #endif