AddInstallRPATHSupport

Add support to RPATH during installation to the project and the targets

add_install_rpath_support

Add support to RPATH during installation to the project:

target_append_install_rpath

Add extra paths to RPATH for a specific target:

  target_append_install_rpath(<target>
                              <INSTALL_DESTINATION destination>
                              [LIB_DIRS dir [dir]]
                              [DEPENDS condition [condition]])

Arguments:
 - ``INSTALL_DESTINATION`` path where the target will be installed.
 - ``LIB_DIRS`` list of directories to be added to the RPATH. These
   directories will be added "relative" w.r.t. the ``INSTALL_DESTINATION``.
 - ``DEPENDS`` list of conditions that should be ``TRUE`` to enable
   RPATH, for example ``FOO; NOT BAR``.