update to changed custom mutator API

[vanhauser-thc]

Hi!

We changed the custom mutator API (and it will not be changed anymore, just expanded), maybe you will want to update your code state :)
https://github.com/AFLplusplus/AFLplusplus/blob/dev/docs/custom_mutators.md

Also do you still need a feature available to support?
If so please open an issue.

Regards,
Marc

[domenukk]

With the current (rather stable, unless you find fatal flaws) API, you'd want to

• add a afl_custom_init function, returning a ptr to your state
• rename afl_custom_mutator to afl_custom_havoc_mutation and change the parameters accordingly
• rename pre_save_handler to afl_custom_post_process (and change the parameters accordingly)
• add a afl_custom_deinit function to clean up

Bonus points if all global state is instead kept in the state returned by _init.