[Issue 9362] Add a method to remove one item to std.container.SList

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=9362

--- Comment #1 from Alexandru Razvan Caciulescu <alexandru.razvan.c at gmail.com> ---
https://github.com/dlang/phobos/pull/5784
https://github.com/dlang/phobos/pull/5786

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