Use boost library names instead of Boost_LIBRARIES var for .pc file generation #187
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This PR only affects the non-catkin case.
In recent versions of FindBoost.cmake (e.g. on Ubuntu 20.04),
Boost_LIBRARIES contains the cmake targets (Boost::thread,
Boost::system) instead of library names.
pkg-config --libs class_loader retruns
[...]-lclass_loader Boost::thread;Boost::system;[...]
Those cannot be linked downstream when cmake is not used or
find_package(Boost) is not executed again to actually find/define the
targets.