By default or when --auto-init is passed to xeno-config, executables
which depend on Copperplate will call copperplate_init()
automatically, before main() runs, hiding such requirement from the
application code.

This mechanism is implemented via ld's --wrap trick, interposing on
the application's main() routine for performing the Copperplate inits
first.

Conversely, passing --no-auto-init to xeno-config disables this
feature.