lib:: fix delete broken symlink failed

Change-Id: I44a35b9767a0b4da5254b5b2a97fed3e03044c0a
tower:https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/4cd86b18dd8043669cda698b0f8ca7f4/#8b1ffa2b4bd6441cb011b10485b3a883
Merge branch 'release/2014.2' into develop

Change-Id: I2c2f554d7ff9501837d14f1227236fa2f8427d8c