Infrastructure

This is kind of a silly oops, but I think we should make a small change to the Visual C++ 2015 notice. Currently it says this:

The development versions require the 64-bit Visual C++ redistributable for Visual Studio 2015 to be installed.

But that doesn't mention that the 64-bit Visual C++ redistributable is only required for Windows builds to run. It seems silly to have that over a page with many operating systems. So to fix it we just make it windows specific. Since we have a new release coming, I removed the development builds limitation.

Windows systems require the 64-bit Visual C++ redistributable for Visual Studio 2015 to be installed.

Feel free to bikeshed the precise wording!