There's no usage of any ENGINE APIs and trying to include the header
breaks compilation with ENGINE support disabled.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

- moved from net to mail category
- removed no-ssl package and added ssl support as configuration option (default enabled)
- added configuration option to support extended logging (default disabled)
- disabled build of test tools
- added LEDE compatibility (support for openssl without SSL3)

Signed-off-by: Federico Di Marco <fededim@gmail.com>