Log Message:
Update to 5.20

Changelog:
Version 5.20, 2015.07.09, urgency: HIGH
* Security bugfixes
  - OpenSSL DLLs updated to version 1.0.2d.
    https://www.openssl.org/news/secadv_20150709.txt
* New features
  - poll(2) re-enabled on MacOS X 10.5 and later.
  - Xcode SDK is automatically used on MacOS X if no other
    locally installed OpenSSL directory is found.
  - The SSL library detection algorithm was made a bit smarter.
  - Warnings about insecure authentication were modified to
    include the name of the affected service section.
  - A warning was added to stunnel.init if no pid file was
    specified in the configuration file (thx to Peter Pentchev).
  - Optional debugging symbols are included in the Win32 installer.
  - Documentation updates (closes Debian bug #781669).
* Bugfixes
  - Signal pipe reinitialization added to prevent turning the
    main accepting thread into a busy wait loop when an external
    condition breaks the signal pipe.  This bug was found to
    surface on Win32, but other platforms may also be affected.
  - Fixed removing the disabled taskbar icon.
  - Generated temporary DH parameters are used for configuration
    reload instead of the static defaults.
  - LSB compatibility fixes added to the stunnel.init script (thx
    to Peter Pentchev).
  - Fixed the manual page headers (thx to Gleydson Soares).

Version 5.19, 2015.06.16, urgency: MEDIUM:
* New features
  - OpenSSL DLLs updated to version 1.0.2c.
  - Added a runtime check whether COMP_zlib() method is implemented
    in order to improve compatibility with the Debian OpenSSL build.
* Bugfixes
  - Improved socket error handling.
  - Cron thread priority on Win32 platform changed to
    THREAD_PRIORITY_LOWEST to improve portability.
  - Makefile bugfixes for stunnel 5.18 regressions.
  - Fixed some typos in docs and scripts (thx to Peter Pentchev).
  - Fixed a log level check condition (thx to Peter Pentchev).

Version 5.18, 2015.06.12, urgency: MEDIUM:
* New features
  - OpenSSL DLLs updated to version 1.0.2b.
    https://www.openssl.org/news/secadv_20150611.txt
  - Added "include" configuration file option to include all
    configuration file parts located in a specified directory.
  - Log file is reopened every 24 hours.  With "log = overwrite"
    this feature can be used to prevent filling up disk space.
  - Temporary DH parameters are refreshed every 24 hours, unless
    static DH parameters were provided in the certificate file.
  - Unique initial DH parameters are distributed with each release.
  - Warnings are logged on potentially insecure authentication.
  - Improved compatibility with the current OpenSSL 1.1.0-dev tree:
    removed RLE compression support, etc.
  - Updated stunnel.spec (thx to Bill Quayle).
* Bugfixes
  - Fixed handling of dynamic connect targets.
  - Fixed handling of trailing whitespaces in the Content-Length
    header of the NTLM authentication.
  - Fixed --sysconfdir and --localstatedir handling (thx to
    Dagobert Michelsen).