cmake boost_json examples

Jackarain/proxy third_party/boost/libs/json/test/cmake_install_test/CMakeLists.txt :10 

find_package(boost_json REQUIRED)

jinja2cpp/Jinja2Cpp thirdparty/external_boost_deps.cmake :25 

find_package(boost_json               ${FIND_BOOST_PACKAGE_QUIET})