CommonsDelinker will delete in-use reference definitions

[Mike Blaszczak]

For example, in this edit: https://en.wikipedia.org/w/index.php?title=A_Little_Man_and_a_House_and_the_Whole_World_Window&diff=next&oldid=1055315335&diffmode=source

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This leaves the article with a visible “Undefined reference “ error.