execve(): disable debug warnings

executer/user/mcexec.c

@@ -502,7 +502,7 @@ retry:
 
 	/* Check whether the resolved path is a symlink */
 	if (lstat(path, &sb) == -1) {
-		fprintf(stderr, "lookup_exec_path(): error stat\n");
+		__dprintf(stderr, "lookup_exec_path(): error stat\n");
 		return errno;
 	}
 

kernel/syscall.c

@@ -1884,7 +1884,7 @@ SYSCALL_DECLARE(execve)
 	ret = do_syscall(&request, ihk_mc_get_processor_id(), 0);
 
 	if (ret != 0) {
-		kprintf("execve(): ERROR: host failed to load elf header, errno: %d\n", 
+		dkprintf("execve(): ERROR: host failed to load elf header, errno: %d\n", 
 				ret);
 		return -ret;
 	}