Fix the compilation failure issue on macOS for Delphi

[delphilite]

Just ensuring successful compilation on the Delphi 12 Mac platform (OSX64, OSXARM64, iOSSimARM64, iOSDevice64), but detailed unit tests are still missing.

[geby]

Isn't this part of the commercial YuOpenSSL distribution? If so, I see no reason to duplicate it here.

[delphilite]

Thanks for the review.

ssl_yuopenssl11 is not intended as a copy of the existing YuOpenSSL distribution. It is a direct adaptation of ssl_openssl11 to the YuOpenSSL 1.x API, providing a more straightforward implementation with fewer dependencies than the current YuOpenSSL 3rd-party approach (ssl_openssl11 + ssl_yuopenssl11_lib).

More importantly, I consider these to be two different TLS backends:

• ssl_openssl11 → OpenSSL dynamic libraries
• ssl_yuopenssl11 → YuOpenSSL static libraries

The current YuOpenSSL integration modifies ssl_openssl11 and switches behavior via {$IFDEF YuOpenSSL}. I don't think backend selection should depend on compiler directives.

Instead, users should be able to explicitly choose the backend in their project:

uses
  ssl_openssl11;

or

uses
  ssl_yuopenssl11;

This keeps backend selection explicit, avoids hidden compile-time behavior changes, and aligns better with Synapse's plugin-based architecture.

For these reasons, I believe ssl_yuopenssl11 should exist as an independent plugin rather than extending ssl_openssl11 through conditional compilation.

[geby]

Isn't this part of the commercial YuOpenSSL distribution? If so, I see no reason to duplicate it here.

[delphilite]

Similar to ssl_yuopenssl11, the goal is to provide a dedicated Synapse plugin for the YuOpenSSL 3.x backend. I believe backend selection should be done by choosing the plugin unit, not by compiler directives inside ssl_openssl11.