Squashed 'third_party/allwpilib/' content from commit b0167e633

Change-Id: I5653017a690eec1917e8fff9017195d8af307926
git-subtree-dir: third_party/allwpilib
git-subtree-split: b0167e6337135545e7053acb89dd5726accc7dec
diff --git a/hal/src/main/native/athena/Constants.cpp b/hal/src/main/native/athena/Constants.cpp
new file mode 100644
index 0000000..6af443d
--- /dev/null
+++ b/hal/src/main/native/athena/Constants.cpp
@@ -0,0 +1,26 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2016-2018 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "hal/Constants.h"
+
+#include "ConstantsInternal.h"
+
+using namespace hal;
+
+namespace hal {
+namespace init {
+void InitializeConstants() {}
+}  // namespace init
+}  // namespace hal
+
+extern "C" {
+
+int32_t HAL_GetSystemClockTicksPerMicrosecond(void) {
+  return kSystemClockTicksPerMicrosecond;
+}
+
+}  // extern "C"