Don't add API annotations in the internal R.java

I'm trying to enable a check for the following structure:
```
/** @hide */
public class Class1 {
    /** @hide */
    @SystemApi // Invalid because the class is hidden.
    public void method1() { }
}
```

The internal R.java file violates this, which this change is going to fix.

Bug: 159162473
Test: build (treehugger)
Test: atest aapt2_tests

Change-Id: I613e8611ddaf5f8e4761d351d4cd0142d59c7cc9
diff --git a/tools/aapt2/java/AnnotationProcessor.h b/tools/aapt2/java/AnnotationProcessor.h
index fdb5846..f217afb 100644
--- a/tools/aapt2/java/AnnotationProcessor.h
+++ b/tools/aapt2/java/AnnotationProcessor.h
@@ -65,7 +65,7 @@
   void AppendNewLine();
 
   // Writes the comments and annotations to the Printer.
-  void Print(text::Printer* printer) const;
+  void Print(text::Printer* printer, bool strip_api_annotations = false) const;
 
  private:
   std::stringstream comment_;