Recommended update for syslog-ng

This update for syslog-ng provides version 3.7.3 and fixes the following issues:

- Add back "Alias=syslog.service" to "syslog.service" (boo#965191)
- Install missing config.h (boo#982487)
- For a detailed description of all fixes from 3.7.3, please refer to
https://github.com/balabit/syslog-ng/releases/tag/syslog-ng-3.7.3

Fixed bugs
bnc#965191
no syslog.service alias created
bnc#982487
syslog-ng-devel lacks of config.h file
Selected Binaries
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