Update submodule

Signed-off-by: Joshua Yang <joshua.yang@hardkernel.com>
diff --git a/WiringPi b/WiringPi
index e099141..7e9bece 160000
--- a/WiringPi
+++ b/WiringPi
@@ -1 +1 @@
-Subproject commit e099141d512639688b690d0ec8bbe14f6328a00d
+Subproject commit 7e9bece6be590091bb9f4b3676ba30345fea6a0e