native frameworks: 64-bit compile issues

- Fix format (print/scanf)
- Suppress unused argument warning messages (bonus)

Change-Id: I05c7724d2aba6da1e82a86000e11f3a8fef4e728
diff --git a/services/sensorservice/GravitySensor.cpp b/services/sensorservice/GravitySensor.cpp
index dd1f650..3cb3745 100644
--- a/services/sensorservice/GravitySensor.cpp
+++ b/services/sensorservice/GravitySensor.cpp
@@ -70,7 +70,7 @@
     return mSensorFusion.activate(ident, enabled);
 }
 
-status_t GravitySensor::setDelay(void* ident, int handle, int64_t ns) {
+status_t GravitySensor::setDelay(void* ident, int /*handle*/, int64_t ns) {
     return mSensorFusion.setDelay(ident, ns);
 }