Cpack doens't seems to search for dependencies properly

[Guillaumebeuzeboc]

All the packages seems to have the same dependencies:
libboost-date-time1.58.0, libc6 (>= 2.4), libgcc1 (>= 1:3.0), libstdc++6 (>= 5.2) although z_lib is using eigen.
It seems that all the packages are using the dependencies of a_lib

[Guillaumebeuzeboc]

CPACK_DEBIAN_PACKAGE_SHLIBDEPS when set to ON list the dependencies for all the subdirectories.
This means that even the simple lib of a workspace will have all the dependencies (imported from another subdirectory).
A workaround for this is to define the workspace as small as possible when creating the .debs (If you just create the deb of the lib a_lib don't include other packages in the ws)

For the future it would be nice to use components and then use CPACK_DEBIAN__PACKAGE_SHLIBDEPS ON
The problem with components is that it would break other features of the project for now.
ex: The version per components is not ready yet https://gitlab.kitware.com/cmake/cmake/merge_requests/2305