add nkmcu

hc

2023-11-06 170c1c0fa90ad9f762d1877f8a57efce706fc95a

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config BR2_PACKAGE_MPFR
    bool "mpfr"
    select BR2_PACKAGE_GMP
    help
      C library for multiple-precision floating-point computations
      with exact rounding.
 
      http://www.mpfr.org/