libcamera use the nlohmann_json wrap indirectly through libpisp. This causes the nlohmann_json.wrap being copied to /subprojects at configure time, and nlohmann_json being downloaded to /nlohmann_json-3.11.2. Add an entryto .gitignore to cover both. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>