disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/arch/xtensa/include/uapi/asm/setup.h
..
..
@@ -14,6 +14,4 @@
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 #define COMMAND_LINE_SIZE	256
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-extern void set_except_vector(int n, void *addr);
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-
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 #endif