ebtables: Convert to standalone build

 * There is no need to create 20 shared libraries on an Android
   build. Convert to a standalone build to eliminate this noise.
 * Additionally, the scriptage in the Android makefile causes
   Ninja to regenerate it's configuration for every build. Fix it.
 * These files can be generated by the standard makefile as part
   of the "static" target.

Change-Id: I1de9f93caf563c10f49c72a884b4c96aaf5335e0
diff --git a/extensions/ebt_nat.c b/extensions/ebt_nat.c
index e6afbf8..8405091 100644
--- a/extensions/ebt_nat.c
+++ b/extensions/ebt_nat.c
@@ -231,7 +231,7 @@
 	.extra_ops	= opts_d,
 };
 
-void _init(void)
+void _nat_init(void)
 {
 	ebt_register_target(&snat_target);
 	ebt_register_target(&dnat_target);