libutils: Properly #ifdef NEEDS_VECTORIMPL_SYMBOLS

 * Compile error might occur otherwise

Change-Id: I982e5f72ea4e84594e415394cceed44f90045526
(cherry picked from commit 1ff785445828a9a40138d67e1de2a4fbae9680e9)
Merge remote-tracking branch 'cyanogen/cm-11.0' into cm-11.0