Dedulicate make_unique

This also gets us off of the WPILib one which goes away for 2019.

Change-Id: I0436ce8fd477bbb27d9b0a7c4832dad01c9bad35
diff --git a/aos/BUILD b/aos/BUILD
index fca0258..2bd5791 100644
--- a/aos/BUILD
+++ b/aos/BUILD
@@ -401,3 +401,11 @@
         "//aos/util:run_command",
     ],
 )
+
+cc_library(
+    name = "make_unique",
+    hdrs = [
+        "make_unique.h",
+    ],
+    visibility = ["//visibility:public"],
+)