[swift-evolution] [Draft] Unify "import Darwin/Glibc" to simply "Libc"

[William Dillon]

> On Mar 8, 2016, at 11:21 AM, Joe Groff via swift-evolution <swift-evolution at swift.org> wrote:
> 
> How much would `Libc` include? The standard C library? POSIX? Does it provide any abstraction over platform-specific differences? In my mind, the common 'Libc' and/or 'POSIX' module would provide a reasonably consistent interface to libc or POSIX, and you'd still have library-specific modules for library-specific APIs.
> 

That would make sense to me, too.  I’m not sure where Brian would draw the line, but as a user, I would expect Libc to include things like stdlib, stdio, and stdint.

- Will