disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/tools/testing/selftests/size/Makefile
..
..
@@ -1,3 +1,4 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
1
2
 CFLAGS := -static -ffreestanding -nostartfiles -s
2
3
 
3
4
 TEST_GEN_PROGS := get_size