C/C++-wrapping Windows/VCC-related issues again

[drkameleon]

Attempting this:
    
    
    type
         ccstring {.importc:"const char*".} = cstring
         WebviewCallback* = proc (seq: ccstring, req: ccstring, arg: pointer) 
{.cdecl.}
    
    
    Run

Again, it has already compiled fine on Mac - let's see what sort of surprise 
comes up from the Windows build.