Update pngcrush to 1.5.7. Changes include:

* Version 1.5.7 (built with libpng-1.2.0)
    * Added setargv.obj to Makefile.msc to expand wildcards, e.g., *.png
    * Use constant string "pngcrush" instead of argv[0] when appropriate.
    * Only check stats for infile==outfile once per input file, or not at
      all if "-nofilecheck" option is present or if a directory was
      created.
    * Fixed bugs with changing bit_depth of grayscale images.

* Version 1.5.6 (built with libpng-1.0.12)
    * Eliminated extra "Removed the cHNK chunk" messages generated by
      version 1.5.5 when "-rem alla" or "-rem allb" is used.
    * All unknown chunks including safe-to-copy chunks are now removed in
      response to the "-rem alla" or "-rem allb" options.
    * Issue a warning if the user tries "-cc" option when it is not
      supported.

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