Android: silence unused warning about m_classLoader

It's used from native c++ code.

Change-Id: I9cc467171f59dbe5e8b12cd06a7b21add33c3f8e
Reviewed-by: Petri Virkkunen <petri.virkkunen@qt.io>

src/android/jar/src/org/qtproject/qt/android/QtLoader.java

@@ -40,6 +40,7 @@ abstract class QtLoader {
     private final String m_packageName;
     private String m_preferredAbi = null;
     private String m_extractedNativeLibsDir = null;
+    /** @noinspection FieldCanBeLocal*/
     private ClassLoader m_classLoader;
 
     protected ComponentInfo m_contextInfo;