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
Change-Id: I4cf84c70dbaabe99310230dfda12385ae5401859

linker/dlfcn.cpp

@@ -245,6 +245,7 @@ soinfo* get_libdl_info() {
     __libdl_info.bucket = g_libdl_buckets;
     __libdl_info.chain = g_libdl_chains;
     __libdl_info.has_DT_SYMBOLIC = true;
+    __libdl_info.ref_count = 1;
   }
 
   return &__libdl_info;