Follow argument changes to RuleBuilder am: c2221d2e7a

Original change: https://android-review.googlesource.com/c/platform/external/robolectric-shadows/+/1500935

Change-Id: I95269eb05bde92d4f3c3b3b229b2500784e49d46
diff --git a/soong/robolectric.go b/soong/robolectric.go
index 7249027..cadeb0f 100644
--- a/soong/robolectric.go
+++ b/soong/robolectric.go
@@ -84,14 +84,14 @@
 
 	b.output = android.PathForModuleGen(ctx, "build.prop")
 
-	rule := android.NewRuleBuilder()
+	rule := android.NewRuleBuilder(pctx, ctx)
 
 	rule.Command().Text("rm").Flag("-f").Output(b.output)
 	for _, l := range lines {
 		rule.Command().Text("echo").Text("'" + l + "'").Text(">>").Output(b.output)
 	}
 
-	rule.Build(pctx, ctx, "build_prop", "robolectric build.prop")
+	rule.Build("build_prop", "robolectric build.prop")
 }
 
 func buildPropsFactory() android.Module {