fix base score, and print message

src/utils/omp.h

@@ -8,7 +8,9 @@
 #if defined(_OPENMP)
 #include <omp.h>
 #else
+#ifndef DISABLE_OPENMP
 #warning "OpenMP is not available, compile to single thread code"
+#endif
 inline int omp_get_thread_num() { return 0; }
 inline int omp_get_num_threads() { return 1; }
 inline void omp_set_num_threads(int nthread) {}