fix warning

readLib/source/Interface.dummy.cc

@@ -41,7 +41,7 @@ namespace corsika_data {
   }
   void cordataclosefile_() { CorDataCloseFile(); }
   double cordatanextnumber_() { return CorDataNextNumber(); }
-  int cordatanexttext_(char* data) {
+  int cordatanexttext_(char*) {
     std::runtime_error("Cannot read compressed data files with dummy library.");
     return 0;
   }