The remote Debian host is missing a security-related update.
This update doesn't fix a vulnerability in linux-tools, but provides support for building Linux kernel modules with the 'retpoline'mitigation for CVE-2017-5715 (Spectre variant 2). This update also includes bug fixes from the upstream Linux 3.16 stable branch up to and including 3.16.56.
Upgrade the linux-tools packages. For the oldstable distribution (jessie), this problem has been fixed in version 3.16.56-1.