libcrypto.num: add EVP_enc_null_hmac_sha256 #1511

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	32m 22s
minimal (windows-2019)	8m 7s
minimal (windows-2022)	8m 39s
plain (windows-2019)	14m 45s
plain (windows-2022)	15m 18s
shared (windows-2019, win64, enable-fips)	24m 51s
shared (windows-2019, win32, --strict-warnings no-fips)	25m 23s
shared (windows-2022, win64, enable-fips)	24m 36s
shared (windows-2022, win32, --strict-warnings no-fips)	24m 48s
	2h 58m 49s

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