add vs6621s support in kernel

lin

2025-07-31 065ea569db06206874bbfa18eb25ff6121aec09b

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{
global:
  EnsureFrontOfChain;
  AddSpecialSignalHandlerFn;
  RemoveSpecialSignalHandlerFn;
  bsd_signal;
  sigaction;
  sigaction64;
  signal;
  sigprocmask;
  sigprocmask64;
local:
  *;
};