debian/control: Add libjson-c-dev to Build-Depends
The igt_runner component in runner/ requires libjson-c-dev to build. However, this dependency is currently missing, so running apt build-dep does not install it. Since igt_runner is a key part of the package, explicitly add libjson-c-dev to Build-Depends.
Signed-off-by: Peter Senna Tschudin peter.senna@linux.intel.com