riemann: Fix parallel build

Add the correct _DEPENDENCIES to libriemann.la, so that parallel make
can figure out the correct order. This will stop the build erroring out
with a linker error.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
scl: Add the graphite() destination SCL

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Preparations for syslog-ng 3.6.0alpha3

Bumped the version in VERSION, and added noteworthy changes to NEWS.md.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>