| Arithmetic on void and Function Pointers

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In GNU C, addition and subtraction operations are supported on pointers to `void` and on pointers to functions. This is done by treating the size of a `void` or of a function as 1.
A consequence of this is that `sizeof` is also allowed on `void` and on function types, and returns 1.
The option '-Wpointer-arith' requests a warning if these extensions are used.