Connect SDK build flag to aconfig binary.

Also add lint check to ensure any changes to the exported lib binary
call happen in both places.

Test: manual via print statement in main.rs
Flag: RELEASE_ACONFIG_SDK_CHECK (build)
Change-Id: Ibd8508a62406b0d6d861f331a1b9747abae3483f
diff --git a/android/config.go b/android/config.go
index 9c614f5..eda8e71 100644
--- a/android/config.go
+++ b/android/config.go
@@ -294,6 +294,10 @@
 	return c.config.productVariables.GetBuildFlagBool("RELEASE_FINGERPRINT_ACONFIG_PACKAGES")
 }
 
+func (c Config) ReleaseAconfigCheckApiLevel() bool {
+	return c.config.productVariables.GetBuildFlagBool("RELEASE_ACONFIG_CHECK_API_LEVEL")
+}
+
 // A DeviceConfig object represents the configuration for a particular device
 // being built. For now there will only be one of these, but in the future there
 // may be multiple devices being built.