cmd/gomobile: call System.loadLibrary for .aar

Change-Id: I3fd099910cfb1fe112ded4386905d370acfea002
Reviewed-on: https://go-review.googlesource.com/11816
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

bind/java/Seq.java

@@ -15,6 +15,14 @@ import java.util.concurrent.Executors;
 // Used by automatically generated language bindings to talk to Go.
 public class Seq {
 	static {
+		// Look for the shim class auto-generated by gomobile bind.
+		// Its only purpose is to call System.loadLibrary.
+		try {
+			Class.forName("go.LoadJNI");
+		} catch (ClassNotFoundException e) {
+			// Ignore, assume the user will load JNI for it.
+		}
+
 		initSeq();
 		new Thread("GoSeq") {
 			public void run() { Seq.receive(); }