Load libraries in breadth-first order

  This patch fixes the problem with symbol search order
  for dlsym(RTLD_DEFAULT/RTLD_NEXT, .) by loading libraries
  and ld_preloads in correct order.

Bug: https://code.google.com/p/android/issues/detail?id=74255
Attempt: 2

(cherry picked from commit 14669a93)

Change-Id: Id87540c96a2242220967b6fa5d84ddcd829e2b97