fwcutter: Import the debian build scripts

Signed-off-by: Michael Buesch <m@bues.ch>
fwcutter manpage: Remove reference to --postfix option

Signed-off-by: Michael Buesch <m@bues.ch>
fwcutter manpage: Fix title

Signed-off-by: Michael Buesch <m@bues.ch>
Update .gitignore

Signed-off-by: Michael Buesch <m@bues.ch>
fwcutter: Add debian patches dir

Signed-off-by: Michael Buesch <m@bues.ch>