Fix build with gnutls versions 3.0 to 3.2 (Bug#32446)
We previously used functions available only in 3.2+ for all 3.x versions. * src/gnutls.c [GNUTLS_VERSION_NUMBER < 0x030501]: Replace calls to gnutls_cipher_get_tag_size with 0. [GNUTLS_VERSION_NUMBER < 0x030200]: Alias gnutls_cipher_get_iv_size to gnutls_cipher_get_block_size, gnutls_digest_list to gnutls_mac_list, and gnutls_digest_get_name to gnutls_mac_get_name. [WINDOWSNT]: Adjust DLL function definitions and declarations accordingly.
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