Remove the useless show_old_php_warning feature

People are usually well-aware of the outdatedness of the PHP version they're
running, which is likely why they're running Snuffleupagus in the first place.

This feature shouldn't have been enabled by default, and I fail to see any case
where anyone would want to enable it. Moreover, it doesn't take LTS versions
from vendors/distributions into account, thus breaking on RHEL/Debian (old)stable.

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