poly1305/poly1305_base2_44.c: add reference base 2^44 implementation.
poly1305/poly1305_base2_44.c: add reference base 2^44 implementation.

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl