riemann-client: Update to 1.10.3.

riemann-c-client 1.10.3

Dependencies on the generated protobuf C sources have been fixed in the Makefile.
A few harmless compile-time warnings have been silenced.
Fixed a few typos in riemann-client(1).

riemann-c-client 1.10.2

A number of formatting issues in the API docs have been fixed.

riemann-c-client 1.10.1

The library compiles on OSX/Darwin again, after fixing a symbol aliasing issue.
Reported by @ilovezfs.

riemann-c-client 1.10.0

Added support for micro-second timestamps (available since Riemann 0.2.13),
implemented by Mathieu Corbin, @mcorbin.  Miscellaneous changes

The parts of the test suite that require a running Riemann server are now
disabled by default, and require setting the RCC_NETWORK_TESTS environment
variable to a non-zero value, before running the test suite.

Fixes an issue on systems that had something else listening on the port, or a
Riemann with a different config than the one the test suite expected.

Reported by Dave Cottlehuber, @dch.

(jperkin)