zbar: fix camera support (enables 'zbarcam' tool)
Add Debian patches (with fetchpatch) to make things work. Among other
things, the patches port the application from V4L to V4L2.
This increases the closure size from 729 MiB to 730 MiB.
(cherry picked from commit 65ccda5b964557190193be8a246eba1819e86561)