Log Message:
Version 1.7.44 (built with libpng-1.5.14 and zlib-1.2.7)

Version 1.7.43 (built with libpng-1.5.13 and zlib-1.2.7)
  Added "remove(inname)" before "rename(outname, inname)" \ 
when using the "-ow"
    option on CYGWIN/MinGW because "rename()" does not work if the \ 
target file
    exists.
  Use the bundled "zlib.h" when PNGCRUSH_H is defined, otherwise use the
    system .

Version 1.7.42 (built with libpng-1.5.13 and zlib-1.2.7)
  Use malloc() and free() instead of png_malloc_default() and
    png_free_default().  This will be required to run with libpng-1.7.x.
  Revised the PNG_ABORT definition in pngcrush.h to work with libpng-1.7.x.
  Revised zutil.h to avoid redefining ptrdiff_t on MinGW/CYGWIN platforms.