Update due to rust-lang#5503.

Author: ehuss

src/cargo/core/compiler/context/compilation_files.rs

@@ -210,7 +210,7 @@ impl<'a, 'cfg: 'a> CompilationFiles<'a, 'cfg> {
         // we don't want to link it up.
         if out_dir.ends_with("deps") {
             // Don't lift up library dependencies
-            if self.roots.contains(unit) {
+            if unit.target.is_bin() || self.roots.contains(unit) {
                 Some((
                     out_dir.parent().unwrap().to_owned(),
                     if unit.mode.is_any_test() {