Add test cases for the custom mutator (#276)

* Minor update

* Fix the soft link of `afl-clang-fast++`

* Add a test case for the custom mutator

- Update the Makefile in examples/custom_mutators
- Add a test program for testing the custom mutator
- Update test.sh for testing the custom mutator
- [TODO] Update the result checking criterias of the custom mutator in
test.sh

* Fix nullptr in the custom mutator

* Fix typo

* Fix invalid memory access bug in `afl_custom_pre_save` of example.c

* example.py: add deinit()

* python mutator: fix nullptr for python mutator data

* test.sh: "trusty-amd64" does not work well with "realpath". Use
"readlink -f" for Ubuntu instead.

* Fix heap allocation bug

- Reason: `afl->out_size` is not consistent with the actual allocation
of `afl->out_buf`. The deleted line in `src/afl-fuzz-one.c` may change
`afl->out_size`, but `afl->out_buf` is not changed

* test.sh: redirect command line output

* afl-fuzz-one.c: minor update

Co-authored-by: Dominik Maier <domenukk@gmail.com>

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