Bug#797224: lyx ftbfs with boost1.58

[Matthias Klose]

Package: src:lyx
Version: 2.1.3-1
Severity: serious
Tags: sid stretch patch

see
https://launchpad.net/ubuntu/+source/lyx/2.1.3-1build1/+build/7845469

the new upstream 2.1.4 builds fine. See
https://launchpad.net/ubuntu/+source/lyx/2.1.4-0ubuntu1