Use size_t instead of std::size_t

The latter does not exist on older compilers.
Revert "Add FindLua52 module (#14224)"

This reverts commit bcb09ef4abee1696b092c93cc95d583fcac1dec7.
Merge topic 'add-cmake_host_system_information-command' into next

09ec083 Use size_t instead of std::size_t
Merge topic 'add-FindLua52' into next

30f9f66 Revert "Add FindLua52 module (#14224)"