libdc1394 v2.2.1 is out: minor update

Minor changes are:
- all files are now under the LGPL2 license
- Don't expose internal symbols
- Randomize read/write retry times on all platforms (use DC1394_SLOW_DOWN)
- Minor bug fixes
- Support POLL and WAIT capture on Windows.

Posted by Damien Douxchamps 2013-01-28