Validate aconfig libs are built with the correct modes.

Bug: 323071835
Test: Unit tests and manual tests.
Change-Id: I32de90826c7c8bb4d8495608e959d554820ab9a2
diff --git a/android/variable.go b/android/variable.go
index be3c80d..73f5bfd 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -500,6 +500,8 @@
 	HiddenapiExportableStubs *bool `json:",omitempty"`
 
 	ExportRuntimeApis *bool `json:",omitempty"`
+
+	AconfigContainerValidation string `json:",omitempty"`
 }
 
 type PartitionQualifiedVariablesType struct {