a9cb6090e2
since libseccomp is required only for building runc and we are only
building containerd binaries in nightly, the libseccomp-dev dependency
is removed. Foreign arch repositories are now removed since
crossbuild-essential-* packages are {arm64, ppc64el,..} cross compiler
packages for amd64 and arch specific repositories are not required.
Signed-off-by: Akhil Mohan <akhilerm@gmail.com>