ev_set_allocator takes signed size

[Samuel Williams]

Is there some reason why ev_set_allocator is defined as:

EV_API_DECL void ev_set_allocator (void *(*cb)(void *ptr, long size)
EV_NOEXCEPT) EV_NOEXCEPT;

And not as:

EV_API_DECL void ev_set_allocator (void *(*cb)(void *ptr, size_t size)
EV_NOEXCEPT) EV_NOEXCEPT;

Because this produces warnings when trying to use `realloc` style
functions, defined as:

void * realloc(void *ptr, size_t size);

where size_t is unsigned.

Kind regards,
Samuel
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