Fix safety comment for LibraryHandle::get_proc_address #1010
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Fix #957 (comment)
I can't add lifetime to the return type directly, I can only add bound to the generic F.
However, I don't think we can add lifetime to function pointer, a newtype that dereferences to F would have the same problem since function pointer is copyable, so the only option is to add a safety comment for this unsafe function.