[dmd-beta] D 1.074 and 2.059 betas

[Nick Sabalausky]

From: "Jonathan M Davis" <jmdavisProg at gmx.com>
>
> However, why would you really want to be able to build with 2.058 once 
> 2.059
> is out? Granted, in the long run, breaking changes should become very 
> uncommon
> such that it doesn't really matter which version of the compiler you're 
> using
> for most things, but still, I don't see why you can't just say that the 
> latest
> compiler is required to use your code if you're posting it somewhere.
>

Because libraries that only work with one compiler version are annoying for 
their users.

Regardless, I've realized I can probably just detect it thanks to the 
brilliant magic that is __traits(compiles,...)  (Take that, "autoconf"! ;))