bind: support types with the same title name as their packages

If a Go struct or interface has the same name as its package class,
append an underscore to the generated Java class name.

Fixes golang/go#23327.

Change-Id: Ib680af35c956801073a0effb510a3ed9bbb8b9d1
Reviewed-on: https://go-review.googlesource.com/87656
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

bind/java/SeqTest.java

@@ -588,4 +588,13 @@ public class SeqTest extends InstrumentationTestCase {
   public void testTags() {
     assertEquals("Constant from a tagged file", 42, Testpkg.TaggedConst);
   }
+
+  public void testClassNameWithPackageName() {
+    testpkg.Testpkg_ o = new secondpkg.Secondpkg_();
+    secondpkg.Secondpkg_ o2 = Secondpkg.newSecondpkg();
+    o2.m();
+    o2.setV("hi");
+    assertEquals(o2.getV(), "hi");
+    Testpkg.clashingParameterFromOtherPackage(o2);
+  }
 }