(sysutils/riemann-client) Updated 1.10.3 to 1.10.4

riemann-c-client 1.10.4
=======================
Released on 2018-12-13

Tests
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* The test suite has been improved, so it can run against a remote Riemann
  server. This was made to support end-to-end testing in a CI environment.
* The (outdated) pre-generated TLS certificates once used for testing are gone,
  and were replaced by a script that generates them on the fly instead.
* The test suite now runs tests serialized, as that results in a more useful
  output.
* The end-to-end networked tests were split out into a separate file.
* The test suite will now compile without warnings when using a recent Check.

(mef)