Log Message:
Update to 0.5.7, mostly bugfixes and more translations.
* libexif/exif-data.h: Introduce an array of ExifContents. This
  doesn't break binary compatibility, but it breaks compilation.
  Do something like "%s/->ifd_0/->ifd[EXIF_IFD_0]" in your source
  code to make it compile again.