Add submodule compat

.gitmodules

@@ -803,3 +803,8 @@
 	url = ../mysql.git
 	fetchRecurseSubmodules = on-demand
 	branch = .
+[submodule "compat"]
+	path = libs/compat
+	url = ../compat.git
+	fetchRecurseSubmodules = on-demand
+	branch = .

libs/compat

@@ -0,0 +1 @@
+Subproject commit 689825b2f9a31439a25df0e53ad1017771bfca6b