First pass on the new SDL sensor API

Android.mk

@@ -36,6 +36,8 @@ LOCAL_SRC_FILES := \
 	$(wildcard $(LOCAL_PATH)/src/power/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/power/android/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/filesystem/android/*.c) \
+	$(wildcard $(LOCAL_PATH)/src/sensor/*.c) \
+	$(wildcard $(LOCAL_PATH)/src/sensor/android/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/render/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/render/*/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/stdlib/*.c) \