update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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config BR2_PACKAGE_CJSON
    bool "cJSON"
    help
      An ultra-lightweight, portable, single-file, simple-as-can-be
      ANSI-C compliant JSON parser, under MIT license.
 
      https://github.com/DaveGamble/cJSON