title: CMake remove added libraries
body: <p>Is there any way to remove a library from the <code>LINK_LIBRARIES</code> added by <code>target_link_libraries</code> ?</p>
  
  <pre><code>target_link_libraries(Project library1 library2)
  get_target_property(cur_cflags Project LINK_LIBRARIES)
  message(STATUS ${cur_cflags})
  # should print library1 and library2
  # here I do something to remove library1
  get_target_property(cur_cflags Project LINK_LIBRARIES)
  message(STATUS ${cur_cflags})
  #should print library2 only
  </code></pre>
  
  <p>Thanks</p>