Update submodule

karlp · karlp · commit 9b7c2c3dbf31 · 2020-02-22T16:20:37.000Z
Primarily to pull in make 4.3 fixes.
diff --git a/libopencm3 b/libopencm3
@@ -1 +1 @@
-Subproject commit 7be50a5e75ed2d163d38a6759347c5e778ac02ab
+Subproject commit cb0661f81de5b1cae52ca99c7b5985b678176db7
