Update to the 2019 wpilib

Lots of gratuitious incompatibilities to deal with. Started sanifying a
few classes rather than figuring out how to update them too. Has not yet
been tested on a robot, but everything still builds so it should be
fine.

Also ported over our FPGA timestamp fixes, which were previously only in
allwpilib_2018.

Also upgraded to the new roborio compiler, which has to happen at the
same time due to incompatible pre-compiled libraries.

Change-Id: Ib9b6ad8fc0112d90a9855afe1b706588ef4ebde9
diff --git a/debian/clapack.BUILD b/debian/clapack.BUILD
index 8d805c3..b839fae 100644
--- a/debian/clapack.BUILD
+++ b/debian/clapack.BUILD
@@ -298,6 +298,8 @@
         ],
         "gcc": [
             "-Wno-discarded-qualifiers",
+            "-Wno-maybe-uninitialized",
+            "-Wno-unused-but-set-variable",
         ],
     }),
     includes = [
diff --git a/debian/slycot.BUILD b/debian/slycot.BUILD
index 7463173..41e7be2 100644
--- a/debian/slycot.BUILD
+++ b/debian/slycot.BUILD
@@ -79,6 +79,7 @@
         "-Wno-unused-parameter",
         "-Wno-missing-field-initializers",
         "-Wno-unused-function",
+        "-Wno-unused-but-set-variable",
     ],
     restricted_to = ["@//tools:k8"],
     deps = [