Update afl to rev 43 via SR 750847
    
    https://build.opensuse.org/request/show/750847
    by user dimstar_suse
    - updated to 2.58c
      - reverted patch to not unlink and recreate the input file, it resulted in performance loss of ~10%
      - added test/test-performance.sh script
      - (re)added gcc_plugin, fast inline instrumentation is not yet finished, however it includes the whitelisting and persistance feature! by hexcoder-
      - gcc_plugin tests added to testing framework
    - jump to 2.57 instead of 2.55 to catch up with Google's versioning
      - persistent mode for QEMU (see qemu_mode/README.md)
      - custom mutator library is now an additional mutator, to exclusivly use it
      - add AFL_CUSTOM_MUTATOR_ONLY (that will trigger the previous behaviour)
      - new library qemu_mode/unsigaction which filters sigaction events
      - afl-fuzz: new command line option -I to execute a command on a new crash
      - no more unlink