sodium_utils{2,3} are not worth running in benchmarks

test/default/sodium_utils2.c

@@ -49,6 +49,10 @@ main(void)
     size_t        size;
     unsigned int  i;
 
+#ifdef BENCHMARKS
+    return 0;
+#endif
+
     if (sodium_malloc(SIZE_MAX - 1U) != NULL) {
         return 1;
     }

test/default/sodium_utils3.c

@@ -44,6 +44,10 @@ main(void)
     void * buf;
     size_t size;
 
+#ifdef BENCHMARKS
+    return 0;
+#endif
+
 #ifdef SIG_DFL
 # ifdef SIGSEGV
     signal(SIGSEGV, segv_handler);