Implement proper Chained Fixup rewriting (for the sake of being able to process pointers larger than 0xFFFFFFFFF)

[0cyn]

look to support. chained fixups needs to correct these pointers.

Line: 235
https://github.com/cxnder/ktool/blob/ea7e6f9f5beecd235e1f73f35c9efb92eb6528d8//src/ktool/macho.py#L232-L242