Emdebian patch files

• emdebian-control.patch (and emdebian-control.in.patch if present) – patches to remove udeb and docs packages and strip out unwanted dependencies.

• emdebian-changelog.patch – appends the emdebian version

• emdebian-rules.patch – removes debhelper or hand-written rules that install documentation or other unwanted files.

• emdebian-$file.patch – details of any other changes to files under debian/

• debian-patch-$file – copied into debian/patches/