disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/arch/x86/.gitignore
..
..
@@ -1,3 +1,4 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
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2
 boot/compressed/vmlinux
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3
 tools/test_get_len
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4
 tools/insn_sanity