Log Message:
Update afl to 2.03b:

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Version 2.03b:
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  - Added experimental -fsanitize-coverage=trace-pc support that goes with
    some recent additions to LLVM, as implemented by Kostya Serebryany.
    Right now, this is cumbersome to use with common build systems, so
    the mode remains undocumented.

  - Made several substantial improvements to better support non-standard
    map sizes in LLVM mode.

  - Switched LLVM mode to thread-local execution tracing, which may offer
    better results in some multithreaded apps.

  - Fixed a minor typo, reported by Heiko Eissfeldt.

  - Force-disabled symbolization for ASAN, as suggested by Christian Holler.

  - AFL_NOX86 renamed to AFL_NO_X86 for consistency.

  - Added AFL_LD_PRELOAD to allow LD_PRELOAD to be set for targets without
    affecting AFL itself. Suggested by Daniel Godas-Lopez.

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Version 2.02b:
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  - Fixed a "lcamtuf can't count to 16" bug in the havoc stage. Reported
    by Guillaume Endignoux.

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Version 2.01b:
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  - Made an improvement to cycle counter color coding, based on feedback
    from Shai Sarfaty.

  - Added a mention of aflize to sister_projects.txt.

  - Fixed an installation issue with afl-as, as spotted by ilovezfs.