Separate PUBLIC and PRIVATE library dependencies
Do not propagate 3d party libs through
IMPORTED_LINK_INTERFACE_LIBRARIES_[DEBUG/RELEASE] mechanism
when building shared libraries. SuiteSparse, lapack & co
are considered private. Glog still gets propagated since
it is part of the public interface. See documentation of
TARGET_LINK_LIBRARIES().

Change-Id: If0563b0c705b102876f5190e9a86694d10f79283