PNaCl Dynamic Linking: Added portable dependencies to shared objects.

src/untrusted/pll_loader/pll_root.h

Index: src/untrusted/pll_loader/pll_root.h
diff --git a/src/untrusted/pll_loader/pll_root.h b/src/untrusted/pll_loader/pll_root.h
index 90dc71283351fe9a17955fc808a066cdf6af9b0f..25ef90246b034fbbe64d97fa456ab44276112869 100644
--- a/src/untrusted/pll_loader/pll_root.h
+++ b/src/untrusted/pll_loader/pll_root.h
@@ -41,6 +41,10 @@ struct PLLRoot {
   size_t bloom_filter_shift2;
   const uint32_t *bloom_filter_data;
 
+  // Dependencies list (akin to DT_NEEDED in ELF).
+  size_t dependencies_count;
+  const char *dependencies_list;
+
   // Thread-local variables (TLS).
   void *tls_template;
   size_t tls_template_data_size;  // Size of initialized data.