xsalsa20-poly1305: swap nonce byte order to make it backwards compatible
xsalsa20-poly1305: swap nonce byte order to make it backwards compatible

rlei/fastd-android,fpletz/fastd,fpletz/fastd,rlei/fastd-android,rlei/fastd-android,rlei/fastd-android,fpletz/fastd,fpletz/fastd,rlei/fastd-android,fpletz/fastd