libgcrypt: update to 1.9.0.

Noteworthy changes in version 1.9.0 (2021-01-19)  [C23/A3/R0]
------------------------------------------------

 * New and extended interfaces:

   - New curves Ed448, X448, and SM2.

   - New cipher mode EAX.

   - New cipher algo SM4.

   - New hash algo SM3.

   - New hash algo variants SHA512/224 and SHA512/256.

   - New MAC algos for Blake-2 algorithms, the new SHA512 variants,
     SM3, SM4 and for a GOST variant.

   - New convenience function gcry_mpi_get_ui.

   - gcry_sexp_extract_param understands new format specifiers to
     directly store to integers and strings.

   - New function gcry_ecc_mul_point and curve constants for Curve448
     and Curve25519.  [#4293]

   - New function gcry_ecc_get_algo_keylen.

   - New control code GCRYCTL_AUTO_EXPAND_SECMEM to allow growing the
     secure memory area.  Also in 1.8.2 as an undocumented feature.

 * Performance:

   - Optimized implementations for Aarch64.

   - Faster implementations for Poly1305 and ChaCha.  Also for
     PowerPC.  [b9a471ccf5,172ad09cbe,#4460]

   - Optimized implementations of AES and SHA-256 on PowerPC.
     [#4529,#4530]

   - Improved use of AES-NI to speed up AES-XTS (6 times faster).
     [a00c5b2988]

   - Improved use of AES-NI for OCB.  [eacbd59b13,e924ce456d]

   - Speedup AES-XTS on ARMv8/CE (2.5 times faster).  [93503c127a]

   - New AVX and AVX2 implementations for Blake-2 (1.3/1.4 times
     faster).  [af7fc732f9, da58a62ac1]

   - Use Intel SHA extension for SHA-1 and SHA-256 (4.0/3.7 times
     faster).  [d02958bd30, 0b3ec359e2]

   - Use ARMv7/NEON accelerated GCM implementation (3 times faster).
     [2445cf7431]

   - Use of i386/SSSE3 for SHA-512 (4.5 times faster on Ryzen 7).
     [b52dde8609]

   - Use 64 bit ARMv8/CE PMULL for CRC (7 times faster).  [14c8a593ed]

   - Improve CAST5 (40% to 70% faster).  [4ec566b368]

   - Improve Blowfish (60% to 80% faster).  [ced7508c85]

 * Bug fixes:

   - Fix infinite loop due to applications using fork the wrong
     way.  [#3491][also in 1.8.4]

   - Fix possible leak of a few bits of secret primes to pageable
     memory.  [#3848][also in 1.8.4]

   - Fix possible hang in the RNG (1.8.3 only).  [#4034][also in 1.8.4]

   - Several minor fixes.  [#4102,#4208,#4209,#4210,#4211,#4212]
     [also in 1.8.4]

   - On Linux always make use of getrandom if possible and then use
     its /dev/urandom behaviour.  [#3894][also in 1.8.4]

   - Use blinding for ECDSA signing to mitigate a novel side-channel
     attack.  [#4011,CVE-2018-0495] [also in 1.8.3, 1.7.10]

   - Fix incorrect counter overflow handling for GCM when using an IV
     size other than 96 bit.  [#3764] [also in 1.8.3, 1.7.10]

   - Fix incorrect output of AES-keywrap mode for in-place encryption
     on some platforms.  [also in 1.8.3, 1.7.10]

   - Fix the gcry_mpi_ec_curve_point point validation function.
     [also in 1.8.3, 1.7.10]

   - Fix rare assertion failure in gcry_prime_check.  [also in 1.8.3]

   - Do not use /dev/srandom on OpenBSD.  [also in 1.8.2]

   - Fix test suite failure on systems with large pages. [#3351]
     [also in 1.8.2]

   - Fix test suite to not use mmap on Windows.  [also in 1.8.2]

   - Fix fatal out of secure memory status in the s-expression parser
     on heavy loaded systems.  [also in 1.8.2]

   - Fix build problems on OpenIndiana et al. [#4818, also in 1.8.6]

   - Fix GCM bug on arm64 which troubles for example OMEMO.  [#4986,
     also in 1.8.6]

   - Detect a div-by-zero in a debug helper tool.  [#4868, also in 1.8.6]

   - Use a constant time mpi_inv and related changes.  [#4869, partly
     also in 1.8.6]

   - Fix mpi_copy to correctly handle flags of opaque MPIs.
     [also in 1.8.6]

   - Fix mpi_cmp to consider +0 and -0 the same.  [also in 1.8.6]

   - Fix extra entropy collection via clock_gettime.  Note that this
     fallback code path is not used on any decent hardware.  [#4966,
     also in 1.8.7]

   - Support opaque MPI with gcry_mpi_print.  [#4872, also in 1.8.7]

   - Allow for a Unicode random seed file on Windows.  [#5098, also in
     1.8.7]

 * Other features:

   - Add OIDs from RFC-8410 as aliases for Ed25519 and Curve25519.
     [also in 1.8.6]

   - Add mitigation against ECC timing attack CVE-2019-13626.  [#4626]

   - Internal cleanup of the ECC implementation.

   - Support reading EC point in compressed format for some curves.
     [#4951]

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