The /sbin/ldconfig.real command in ubuntu for ppc64le cannot be executed
in docker images since the binfmt-misc configuration does not match the
executable file format. This patch is a port of
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=794737 to linuxkit
Signed-off-by: Olaf Flebbe <of@oflebbe.de>