libct: use `unix.Getwd` instead of `os.Getwd` to avoid symlink
libct: use `unix.Getwd` instead of `os.Getwd` to avoid symlink

Signed-off-by: wineway <9720fd93e8aa818a463ac2792906505972f06863@gmail.com>

opencontainers/runc,opencontainers/runc,opencontainers/runc,opencontainers/runc