Return Timelocked instead of (Timelock, Vec<SpendableOutput>)

Timelocked doesn't expose the Vec yet requires calling not_locked(), 
unlocked(Timelock), or ignore_timelock().

processor/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+  println!("cargo:rustc-link-arg=-zmuldefs");
+}