Resync clippy to v0.0.156

Manishearth · Manishearth · commit 9e644e2da628 · 2017-09-03T14:33:28.000-07:00
diff --git a/src/tools/clippy b/src/tools/clippy
@@ -1 +1 @@
-Subproject commit 4402bc70a3b175c38994bbc802bee41ddc59165b
+Subproject commit 25444585592f5da648edd5317fcdd21f2db8bb64
