Use boost from our source tree

Hopefully this will make master build on robotics.mvla.net again.

Change-Id: Ia7d9dce1aa49dcb909a5dedd5e6bcb673ff66c11
diff --git a/third_party/boostorg/fusion/BUILD b/third_party/boostorg/fusion/BUILD
new file mode 100644
index 0000000..e0e1e33
--- /dev/null
+++ b/third_party/boostorg/fusion/BUILD
@@ -0,0 +1,8 @@
+licenses(["notice"])  # boost
+
+cc_library(
+    name = "fusion",
+    hdrs = glob(["include/**"]),
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+)