disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/tools/build/feature/test-get_current_dir_name.c
..
..
@@ -8,3 +8,4 @@
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 	free(get_current_dir_name());
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 	return 0;
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 }
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+#undef _GNU_SOURCE