:wrench: Do not use libgpiod build system

diff --git a/plug b/plug
index b1b889d924e8b82bea98df47354826295a5b2192..9c12c21cb0f237fdb99836ed3597d0ba5baa7399 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit b1b889d924e8b82bea98df47354826295a5b2192
+Subproject commit 9c12c21cb0f237fdb99836ed3597d0ba5baa7399