Log Message:
stunnel: update to 5.59

### Version 5.59, 2021.04.05, urgency: HIGH
* Security bugfixes
  - OpenSSL DLLs updated to version 1.1.1k.
* New features
  - Client-side "protocol = ldap" support (thx to Bart
    Dopheide and Seth Grover).
* Bugfixes
  - The test suite fixed not to require external connectivity.
  - Fixed paths in generated manuals (thx to Tatsuki Makino).
  - Fixed configuration reload when compression is used.
  - Fixed compilation with early releases of OpenSSL 1.1.1.