Add permitted_when_isolated_path to linker namespaces

The permitted_when_isolated_path is a way to white-list
directories not present in search-path. It is ignored for
not isolated namespaces.

Bug: http://b/25853516
Bug: http://b/22548808
Change-Id: Ib1538037268eea69323ea49968a34a4a1d1938a5
diff --git a/linker/linker.h b/linker/linker.h
index b391fc3..49329c7 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -446,6 +446,7 @@
 
 bool init_namespaces(const char* public_ns_sonames, const char* anon_ns_library_path);
 android_namespace_t* create_namespace(const char* name, const char* ld_library_path,
-                                      const char* default_library_path, bool is_isolated);
+                                      const char* default_library_path, bool is_isolated,
+                                      const char* permitted_when_isolated_path);
 
 #endif