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* compat: Add OpenSSL libcrypto compatibility layer Detect libcrypto in configure script. Only fall back to using libcrypto when /usr libs are allowed and no other compatible implementation is available or when --with-openssl is passed explicitly. Make sure libcrypto and libmd are never linked at the same time. Add OpenSSL based SHA256 and HMAC compat shims in compat/crypt_openssl. Depeding on version and build flags, libcrypto ships with a compatible SHA256 API in "openssl/sha.h". OpenSSL 3 has deprecated the SHA API, so if it is not detected we fall back to an EVP_DIGEST based version. Because the API might still be in use in OpenSSL internally, the compatibility wrappers have a dhcpcd_ prefix to avoid symbol conflicts. * Add sha256 tests based on the existing hmac-md5 tests.