Suggestion: std.ctypes

[Walter Bright]

Sean Kelly wrote:
> All C declarations in the Ares C99 and Posix headers use c_long 
> (excepting maybe some of the darwin blocks, as I didn't write those), so 
> adding version logic for Unix64 platforms should be quite simple.

You're right, I went through the same thinking process. I originally was 
going to do an std.ctypes, but the result just looked terrible, and 
frankly, the problems with just translating the types directly into D 
types work out tolerably well enough.