[moveit_core] Fix export of FCL dependency

[jspricke]

Regression of 93c3f63
Closes: #2804

[jspricke]

This is a little hacky but according to someone who does not want to be named "should work", alternatively we could export the target but EXPORTED_TARGETS in catkin did not work or use CFG_EXTRAS...

[codecov]

Codecov Report

Merging #2819 (094743b) into master (6e798bf) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2819      +/-   ##
==========================================
- Coverage   60.82%   60.81%   -0.00%     
==========================================
  Files         366      366              
  Lines       31713    31713              
==========================================
- Hits        19285    19283       -2     
- Misses      12428    12430       +2     

Impacted Files	Coverage Δ
...meterization/work_space/pose_model_state_space.cpp	81.14% <0.00%> (-1.88%)	⬇️
...ipulation/pick_place/src/manipulation_pipeline.cpp	69.45% <0.00%> (-1.85%)	⬇️
...g_scene_interface/src/planning_scene_interface.cpp	47.46% <0.00%> (-1.12%)	⬇️
...on/pick_place/src/approach_and_translate_stage.cpp	73.38% <0.00%> (-0.64%)	⬇️
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	77.87% <0.00%> (-0.38%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	68.27% <0.00%> (+0.14%)	⬆️
.../ompl_interface/src/detail/constrained_sampler.cpp	59.46% <0.00%> (+16.22%)	⬆️

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[v4hn]

Thanks for finding the culprit. half-exporting the target explains the behavior... I remember we previously used CFG_EXTRAS for Boost components somewhere, but I can't find it anymore.

I don't particularly like the solution because other libraries might follow in the future, but it's good enough for now. Thank you!