[PATCH] Implement SM3 hash algorithm in gnulib and the computing tool in coreutils.

[张佳(乾越)]

Hi,

This is the review request for SM3 hash algorithm. SM3 hash algorithm is
already
accepted and supported by TPM 2.0 spec. See page 284 in TPM 2.0 spec part 1
(https://trustedcomputinggroup.org/wp-content/uploads/TPM-Rev-2.0-Part-1-Ar
chitecture-01.38.pdf)

Currently, I only implement SM3 in gnulib. I will implement it in
libgcrypt and
openssl later.

Plz refer to the following PRs for code review.

- For the new gnulib module crypto/sm3
  https://github.com/coreutils/gnulib/pull/3/commits

- For the new program sm3sum
  https://github.com/coreutils/coreutils/pull/12/commits

Thanks,
Jia