disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

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# From http://www.multiprecision.org/index.php?prog=mpc&page=download
sha1    b8be66396c726fdc36ebb0f692ed8a8cca3bcc66    mpc-1.0.3.tar.gz
sha256 da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768  COPYING.LESSER