loader: fix leak of child-to-parent links on dlclose() am: 46c3aa2c -s ours am: 02b94ea8 am: 623d8375 am: 254aec13 am: c65740f4 am: 59abd613 am: 2514cb78 Change-Id: I333d717351fb970e651260a7ec88d17bc9a1c014