Merge pull request #42147 from thaJeztah/20.10_backport_41704_update_libseccomp

[20.10 backport] Use buster backports to build with libseccomp-2.4.4

Dockerfile

@@ -119,6 +119,7 @@ FROM cross-${CROSS} as dev-base
 
 FROM dev-base AS runtime-dev-cross-false
 ARG DEBIAN_FRONTEND
+RUN echo 'deb http://deb.debian.org/debian buster-backports main' > /etc/apt/sources.list.d/backports.list
 RUN --mount=type=cache,sharing=locked,id=moby-cross-false-aptlib,target=/var/lib/apt \
     --mount=type=cache,sharing=locked,id=moby-cross-false-aptcache,target=/var/cache/apt \
         apt-get update && apt-get install -y --no-install-recommends \
@@ -127,7 +128,7 @@ RUN --mount=type=cache,sharing=locked,id=moby-cross-false-aptlib,target=/var/lib
             libapparmor-dev \
             libbtrfs-dev \
             libdevmapper-dev \
-            libseccomp-dev \
+            libseccomp-dev/buster-backports \
             libsystemd-dev \
             libudev-dev
 
@@ -137,15 +138,16 @@ ARG DEBIAN_FRONTEND
 # on non-amd64 systems.
 # Additionally, the crossbuild-amd64 is currently only on debian:buster, so
 # other architectures cannnot crossbuild amd64.
+RUN echo 'deb http://deb.debian.org/debian buster-backports main' > /etc/apt/sources.list.d/backports.list
 RUN --mount=type=cache,sharing=locked,id=moby-cross-true-aptlib,target=/var/lib/apt \
     --mount=type=cache,sharing=locked,id=moby-cross-true-aptcache,target=/var/cache/apt \
         apt-get update && apt-get install -y --no-install-recommends \
             libapparmor-dev:arm64 \
             libapparmor-dev:armel \
             libapparmor-dev:armhf \
-            libseccomp-dev:arm64 \
-            libseccomp-dev:armel \
-            libseccomp-dev:armhf
+            libseccomp-dev:arm64/buster-backports \
+            libseccomp-dev:armel/buster-backports \
+            libseccomp-dev:armhf/buster-backports
 
 FROM runtime-dev-cross-${CROSS} AS runtime-dev