Bump ZBar to version 0.21

  * zbarcam-qt: allow selecting codes via GUI interface
  * When both enabled, ISBN-13 has precedence over ISBN-10
  * ZBar is now using Travis CI for continuous integration tests
  * Convert INSTALL and README to markdown and update them
  * Improve ZBar testing code and make easier to run the tests
  * Fix build with Clang
  * Add simple dbus IPC API to zbarcam.
  * zbarimg: display only the compiled symbologies
  * v4l2: make ZBar build and run on Kernels < 3.16
  * configure.ac: The pdf417 code is incomplete. Warn about that
  * Add Debian packaging and Travis CI configuration
  * Add barcode examples for different supported symbologies
  * Several improvements at the building system
  * Add support for SQ code symbology
  * v4l2: add fallback for systems without v4l2_ext_controls which field
  * v4l2: use device_caps instead of capabilities
  * v4l2: make v4l2_request_buffers() more generic
  * release video buffers after probing and request them again when needed
  * Ignore ENOTTY errors when calling VIDIOC_S_CROP
  * doc/Makefile.am.inc: clean html generated files
  * Add --disable-doc configure option to disable building docs
  * Fix function protoype to be compatible with recent libjpeg
  * Wrap logical not operations into parentheses
  * INSTALL: warn that autoconf should be called before configure
  * code128: fix error logic
  * convert: ensure that it will not use a freed value
  * zbar: use g_thread_new() instead of g_tread_create()
  * zbargtk: add a missing break
  * gtk/zbargtk: add a missing check if zbar->window is not null
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