Add dist target for robolectric-tests.zip

Also remove stray fmt.Println.

Test: m robolectric-tests
Change-Id: Ia463c2b395fadd6ab33b2ce8364f2119b2a2be1e
diff --git a/android/test_suites.go b/android/test_suites.go
index b6ca0e6..7b2d7dc 100644
--- a/android/test_suites.go
+++ b/android/test_suites.go
@@ -47,10 +47,12 @@
 	})
 
 	t.robolectric = robolectricTestSuite(ctx, files["robolectric-tests"])
+
+	ctx.Phony("robolectric-tests", t.robolectric)
 }
 
 func (t *testSuiteFiles) MakeVars(ctx MakeVarsContext) {
-	ctx.Strict("ROBOLECTRIC_TEST_SUITE", t.robolectric.String())
+	ctx.DistForGoal("robolectric-tests", t.robolectric)
 }
 
 func robolectricTestSuite(ctx SingletonContext, files map[string]InstallPaths) WritablePath {