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Avoid empty-argument lists in C function declarations #21

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() as a function argument list in C is equivalent to (...), i.e, in C
you get at most a warning, if it is called with too many arguments. Clarify
this situation by explicitly stating (void) as argument list.

`()` as a function argument list in C is equivalent to `(...)`, i.e, in C
you get at most a warning, if it is called with too many arguments. Clarify
this situation by explicitly stating `(void)` as argument list.
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