[D-runtime] Druntime external bindings not included in build?

[Martin Nowak via D-runtime]

On 01/19/2015 11:08 PM, Steven Schveighoffer via D-runtime wrote:
>
> http://forum.dlang.org/post/ibmdevyxwkwyqjxerpyn@forum.dlang.org

That's actually a bug in dmd 
(https://issues.dlang.org/show_bug.cgi?id=14014).
Pollfd doesn't require linkage because it's a zero initialized struct.

> I have discovered that the issue is poll.d is not included in the build for druntime.
>
> I also have discovered that scores of other modules are not included. Is there a reason not to include a druntime module in the build? If not, I'll try to add them all.

Creates and links unnecessary ModuleInfo.