Bump to version 0.22.1.
0.22.1:
- Ensure that version.xml and reldate.xml will be placed at the source dir
- Make use of glib thread names
- Windows: Make zbargtk build
- Windows: Use -no-undefined for libzbargtk
- Windows: Disable zbarcam-gtk
- Windows: Check for clock_gettime on pthread library as well
- Windows: Specify correct path to barcode.png
- Windows: Include windows.h for vfw
- Makefile.am: Add missing extra-dist-file
- configure.ac: allow building libzbar-qt as a static library