Fix add_patch script.
Add some more patches to make dkms succeed on recent kernels.

Also add dh_autoreconf as we modify configure.ac
Also apply the changs from upstream's 530ef7f for dkms.

vmblock should be used via fuse now, vmsync is not needed anymore.
Pick patch from upstream: Harden HostinfoOSData
Pick patch from upstream: building on kfreebsd.