disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

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config BR2_PACKAGE_FLEX
    bool "flex"
    help
      A fast lexical analyser generator. A tool for generating
      programs that perform pattern-matching on text.
 
      Only the library is available.
 
      https://github.com/westes/flex/