Bug#962286: ros-dynamic-reconfigure build depends on libboost-signals-dev that is removed in boost1.71

[Adrian Bunk]

Source: ros-dynamic-reconfigure
Version: 1.6.0-3
Severity: serious
Tags: ftbfs
Control: block 961995 by -1

https://buildd.debian.org/status/package.php?p=ros-dynamic-reconfigure

libboost-signals-dev is removed in boost1.71.