configure.ac: Define HAVE_JSON_C properly

Signed-off-by: Gergely Nagy <algernon@balabit.hu>
Preparations for riemann-c-client 1.1.1

NEWS and VERSION updated for the 1.1.1 release.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Merge tag 'riemann-c-client-1.1.1' into debian/master

riemann-c-client 1.1.1 release
debian/changelog: Updated for 1.1.1-1

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