Add the name of needed_by library to the warning

Bug: http://b/26394120
Change-Id: I8dbf1d0d879e967563ad3158ee3c0e4284dfa533
diff --git a/linker/linker.cpp b/linker/linker.cpp
index 791f94d..228216f 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -1767,8 +1767,9 @@
     if (is_greylisted(name, needed_by)) {
       // print warning only if needed by non-system library
       if (needed_by == nullptr || !is_system_library(needed_by->get_realpath())) {
-        DL_WARN("library \"%s\" (\"%s\") is not accessible for the namespace \"%s\" - the access is temporarily granted as a workaround for http://b/26394120",
-                name, realpath.c_str(), ns->get_name());
+        DL_WARN("library \"%s\" (\"%s\") needed by \"%s\" is not accessible for the namespace \"%s\""
+                " - the access is temporarily granted as a workaround for http://b/26394120",
+                name, realpath.c_str(), needed_by->get_realpath(), ns->get_name());
       }
     } else {
       // do not load libraries if they are not accessible for the specified namespace.