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

(cherry picked from commit a3ad450a)

Change-Id: I1125de10272c84e4f075cbc72859c1f6b3e89943