Fix syslog defines

config.h defines HAVE_SYSLOG_H whereas the sources are looking for
NO_SYSLOG to be undefined. As the logic of "if feature is available"
makes more sense than "if feature is not unavailable", I opted for the
config.h define.
Define LOG_ERR for systems without syslog.h
Merge branch 'lewellyn/nosyslog/OTP-11349' into maint

* lewellyn/nosyslog/OTP-11349:
  Define LOG_ERR for systems without syslog.h
  Fix syslog defines
Update version numbers for R16B03 development
Merge branch 'fredrik/update_versions_R16B03' into maint

* fredrik/update_versions_R16B03:
  Update version numbers for R16B03 development