DO NOT MERGE: Revert "delete libnl_2"

This reverts commit 7097f052d946bc9fbe298c7a88e1d943f54f684e.

libnl_2 needs to stay in AOSP for now for compatibility with
GPL test builds.
diff --git a/libnl_2/dbg.c b/libnl_2/dbg.c
new file mode 100644
index 0000000..9764de6
--- /dev/null
+++ b/libnl_2/dbg.c
@@ -0,0 +1,12 @@
+#include "netlink/netlink.h"
+#include <android/log.h>
+
+void libnl_printf(int level, char *format, ...)
+{
+	va_list ap;
+
+	level = ANDROID_LOG_ERROR;
+	va_start(ap, format);
+	__android_log_vprint(level, "libnl_2", format, ap);
+	va_end(ap);
+}