Got basic code building with the roboRIO compiler.

Change-Id: I158caa4786542344e91949c62fd95a79015b653b
diff --git a/aos/externals/BUILD b/aos/externals/BUILD
index bd7be3c..0991067 100644
--- a/aos/externals/BUILD
+++ b/aos/externals/BUILD
@@ -19,10 +19,13 @@
   ]) + [
     'forwpilib/dma.cc',
   ],
+  copts = [
+    '-Wno-error',
+  ],
   hdrs = glob([d + '/*.h' for d in _header_dirs]),
   includes = _header_dirs,
   linkopts = [
-    '-Lallwpilib/ni-libraries',
+    '-Laos/externals/allwpilib/ni-libraries',
     '-lpthread',
     '-lFRC_NetworkCommunication',
     '-lRoboRIO_FRC_ChipObject',