Log Message:
Update to 1.58b:

Version 1.58b:
--------------

  - Added a workaround for abort() behavior in -lpthread programs in QEMU mode.
    Spotted by Aidan Thornton.

  - Made several documentation updates, including links to the static
    instrumentation tool (sister_projects.txt).

--------------
Version 1.57b:
--------------

  - Fixed a problem with exception handling on some versions of MacOS X.
    Spotted by Samir Aguiar and Anders Wang Kristensen.

  - Tweaked afl-gcc to use BIN_PATH instead of a fixed string in help
    messages.