add arch linux sandboxing mount points (#8147)

plugin/rpcplugin/sandbox/sandbox_linux.go

@@ -67,6 +67,10 @@ func systemMountPoints() (points []*MountPoint) {
 		"/lib",
 		"/lib32",
 		"/lib64",
+		"/usr/lib",
+		"/usr/lib32",
+		"/usr/lib64",
+		"/etc/ca-certificates",
 		"/etc/ssl/certs",
 		"/system/etc/security/cacerts",
 		"/usr/local/share/certs",