Remove pam-security-abstract-securetty-handling.patch and
pam-unix-nullok-secure.patch, patches coming from debian,
difficult to rebase, and their purpose is unclear.
Disable doc generation, as libpam messes up native and target
compiler options.
Adjust dependencies and packaging.
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>