Update clippy

Manishearth · Manishearth · commit f4017a845316 · 2018-08-14T11:29:00.000-07:00
diff --git a/src/tools/clippy b/src/tools/clippy
@@ -1 +1 @@
-Subproject commit 99a087bea59c8f808b5485c6113edf9ce774e94a
+Subproject commit bac76afb5a7885de19bfd9e6191fe8e2a29bd74d
