Bug 1387742 - Whitelist default dynamic linker paths, including /lib64. r=jld

MozReview-Commit-ID: B4HpKZQL8Y0

--HG--
extra : rebase_source : 8303bcc547d5802280c1a1b18fd98c632cc4d387

security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp

@@ -99,6 +99,7 @@ SandboxBrokerPolicyFactory::SandboxBrokerPolicyFactory()
   policy->AddPath(rdonly, "/proc/cpuinfo");
   policy->AddPath(rdonly, "/proc/meminfo");
   policy->AddDir(rdonly, "/lib");
+  policy->AddDir(rdonly, "/lib64");
   policy->AddDir(rdonly, "/etc");
   policy->AddDir(rdonly, "/usr/share");
   policy->AddDir(rdonly, "/usr/local/share");