INSTALL_RPATH_USE_LINK_PATH
---------------------------

Add paths to linker search and installed rpath.

``INSTALL_RPATH_USE_LINK_PATH`` is a boolean that if set to ``True`` will
append directories in the linker search path and outside the project
to the :prop_tgt:`INSTALL_RPATH`.  This property is initialized by the value of
the variable ``CMAKE_INSTALL_RPATH_USE_LINK_PATH`` if it is set when a
target is created.
