std: remove remaining mentions of #425

[wooster0]

GitHub issue #425 has been closed and this cleans up remaining code that was written when that issue was open.

[mlugg]

You can make a function always run at comptime by marking it as inline and wrapping its body in a comptime block. This definitely makes sense to do for versionCheck, and perhaps also for globalOption.

[wooster0]

I think for now I would rather not do something like that unless necessary. I'm not too sure about it. And builtin.os.isAtLeast which is a similar case that you can find in the diff doesn't do that either. Well, it is inline but it doesn't seem to force comptime within its body. Instead, that's done at each call site which is the way I would do it too.

By the way now that I think about it, wouldn't it make sense for any function where all parameters are comptime to always be evaluated at comptime? Wouldn't it be nice if we just made that a guarantee? Could be that I'm missing some obvious problem with that. Because all input is comptime, it should be able to give a comptime output, though, maybe not if it uses global runtime variables and stuff. Hmm, I guess that doesn't really work if it makes use of anything from outside that's not comptime.