OpenWRT/LEDE only understands the PKG_MD5SUM variable, and detects if the
hash is e.g. SHA256 by looking at the length of the hash.

This affects libs/libmicrohttpd, mail/ssmtp and utils/mc.

Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>

* sendmail symlink handling is no longer forced and part of install step

Signed-off-by: Dirk Brenken <dev@brenken.org>

* change maintainer email address
* switch to sha256sum fingerprint
* cosmetics

Signed-off-by: Dirk Brenken <dev@brenken.org>

remove needless dead.letter function (at least on embedded devices)
backport debian fixes (slightly modified)

compile tested. Please apply to upstream - thank you!

Signed-off-by: Dirk Brenken <dirk@brenken.org>

Drop gnutls and use openssl instead, due to excessive memory consumption in embedded environment for an additonal ssl library.

Signed-off-by: Dirk Brenken <dibdot@gmail.com>

Signed-off-by: Dirk Brenken <dibdot@gmail.com>