In C, a function `void func()` doesn't declare a function without
arguments, instead it declares a function that takes unspecified
number of arguments. The correct way to declare a function that
takes no arguments is to use the `void` keyword: `void
func(void)`.
What is the correct way to refer to such a function (`void
func()`) from D bindings?
If I assume that the unspecified number of arguments (for some
particular function) is equal to zero, is `extern (C) void
func()` a correct D binding to the both functions `void func()`
and `void func(void)` declared in C?
Specifically, I'm concerned about calling convention issues.
