Merge topic 'ci-linux-extdeps'

b55152e7ad gitlab-ci: add jobs to test CMake with external dependencies on Linux
6a05d107ca ci: add CMake external build dependencies to Debian and Fedora base images
d3c1b8a491 jsoncpp: Require version 1.6.0 when using system-provided library
68d3ca7008 Tests: Fix RunCMake.FileAPI test with jsoncpp < 1.7.5

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !7592