build_library: remove two Docker files not used on Flatcar

They were previously in /usr/share/docker/contrib which means they were
deleted at build time and not shipped into Docker sysext.

New ebuild version of Docker now provides those two files as symlinks to
/usr/share/docker/contrib from /usr/bin.

We can't really remove symlinks using find as docker-runc,
docker-containerd, etc. are broken symlinks too during the build phase.

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

build_library/sysext_mangle_docker-flatcar

@@ -6,6 +6,9 @@ rootfs="${1}"
 # Remove debug and contrib
 echo ">>> NOTICE: $0: removing '/usr/lib/debug/', '/usr/share/docker/contrib' from sysext"
 rm -rf "${rootfs}/usr/lib/debug/" "${rootfs}/usr/share/docker/contrib/"
+# For Docker 27.2.1, two files are symlinked to /usr/share/docker/contrib
+# There were previously shipped directly in /usr/share/docker/contrib folder
+rm -f "${rootfs}/usr/bin/{dockerd-rootless-setuptool.sh,dockerd-rootless.sh}"
 
 script_root="$(cd "$(dirname "$0")/../"; pwd)"
 files_dir="${script_root}/sdk_container/src/third_party/coreos-overlay/coreos/sysext/docker"