More version(unittest) blocks removed

[alexandrumc]

Please see #2888

[dlang-bot]

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[MoonlightSentinel]

Keep the old behaviour (ditto for other functions, structs, classes)

Suggested change

	void testXCHG(T)(T val) pure nothrow @nogc @trusted
	static void testXCHG(T)(T val) pure nothrow @nogc @trusted

[MoonlightSentinel]

Why not keep these blocks to signify that they different tests?
(Bonus: That would imply a much smaller diff and does not screw with the line history)