OpenSSL 1.1 Port

[quantum5]

Changes proposed in this pull request:

• Changed Mayaqua to be compilable against OpenSSL 1.1.x.
• Some potentially sketchy change regarding Ssl_Init_Async_SendAlert that I'd feel much better about if someone can tell me what it actually does.

Option 1 chosen.

[dnobori]

Thank you so much for your contribution to enrich the SoftEther VPN source code.

Your patch has been merged on the main source-tree of SoftEther VPN.

As a token of our gratitude, your GitHub username will be added on the AUTHORS.TXT file and on the header of the related source file.
(It will be done within a few days.)
https://github.com/SoftEtherVPN/SoftEtherVPN/blob/master/AUTHORS.TXT

Thanks again for your contribution.

[dnobori]

This patch has a bug. I fixed it on the following patch.
1f2c052