mk: Make wget ignore the cert

The server certificate provided by git.kernel.org seems to be for www.
Version bump: 2.4.9-2
.gitignore: Ignore files generated by dh/dpkg
.gitignore: Ignore debian/dkms.conf
mk: Fix typo
mk: videobuf: Fix upstream version number
Fix inclusion of videobuf-dma-{sg,contig}
mk: Merge videobuf.mk back to Makefile
Version bump: 2.4.9-3