interrogate: remove apparently-unused definition

dtool/src/interrogate/interrogateBuilder.cxx

@@ -388,9 +388,6 @@ write_code(ostream &out_code,ostream * out_include, InterrogateModuleDef *def) {
   declaration_bodies << "#include <sstream>\n";
 
   if (build_python_native) {
-    if (library_name.size() > 1) {
-      declaration_bodies << "#define PANDA_LIBRARY_NAME_" << library_name << "\n";
-    }
     declaration_bodies << "#include \"py_panda.h\"\n";
     declaration_bodies << "#include \"extension.h\"\n";
     declaration_bodies << "#include \"dcast.h\"\n";