- updated to 4.21c
  * afl-fuzz
    - fixed a regression in afl-fuzz that resulted in a 5-10% performace loss
      do a switch from gettimeofday() to clock_gettime() which should be rather
      three times faster. The reason for this is unknown.
    - new queue selection algorithm based on 2 core years of queue data
      analysis. gives a noticable improvement on coverage although the results
      seem counterintuitive :-)
    - added AFL_DISABLE_REDUNDANT for huge queues
    - added `AFL_NO_SYNC` environment variable that does what you think it does
    - fix AFL_PERSISTENT_RECORD
    - run custom_post_process after standard trimming
    - prevent filenames in the queue that have spaces
    - minor fix for FAST schedules
    - more frequent stats update when syncing (todo: check performance impact)
    - now timing of calibration, trimming and syncing is measured seperately,
      thanks to @eqv!
    - -V timing is now accurately the fuzz time (without syncing), before
      long calibration times and syncing could result in now fuzzing being
      made when the time was already run out until then, thanks to @eqv!
    - fix -n uninstrumented mode when ending fuzzing
    - enhanced the ASAN configuration
    - make afl-fuzz use less memory with cmplog and fix a memleak
  * afl-cc:
    - re-enable i386 support that was accidently disabled
    - fixes for LTO and outdated afl-gcc mode for i386
    - fix COMPCOV split compare for old LLVMs
    - disable xml/curl/g_ string transform functions because we do not check
      for null pointers ... TODO
    - ensure shared memory variables are visible in weird build setups

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