Updated libopencm3 to the newest version.

esden · esden · commit 408ba8c88516 · 2015-02-20T20:51:59.000-08:00
diff --git a/libopencm3 b/libopencm3
@@ -1 +1 @@
-Subproject commit 5658a4ebcff368d28bc5e5bdfa574ba3651c346a
+Subproject commit fd141a81313876e3dc9253d682f7314fa2a59718
