Revert #4273 + add test

[CyberShadow]

#4273

https://issues.dlang.org/show_bug.cgi?id=16514

[dlang-bot]

Fix	Bugzilla	Description
✗	16514	std.socket methods are const, and thus cannot be overriden for SSLSocket, for example

[CyberShadow]

@wilzbach Do I need to do something about the codecov "failure"?

[wilzbach]

@wilzbach Do I need to do something about the codecov "failure"?

Not at all - it's just warning you that by reverting you remove some tests and thus the overall coverage. That's why it's only a warning and not required ;-)

edit: the added tests isn't executed, thus the "new unhit" lines.

[CyberShadow]

Thanks. Though I think the decreased coverage is due to the compilation "test", which generates uncovered (and uncoverable) lines.