Java API: fix build warning on OS X

Common part of all source files is extracted to special header

modules/java/generator/src/cpp/converters.cpp

@@ -1,12 +1,4 @@
-#include "converters.h"
-
-#if defined DEBUG && defined ANDROID
-#include <android/log.h>
-#define MODULE_LOG_TAG "OpenCV.converters"
-#define LOGD(...) ((void)__android_log_print(ANDROID_LOG_DEBUG, MODULE_LOG_TAG, __VA_ARGS__))
-#else //DEBUG
-#define LOGD(...)
-#endif //DEBUG
+#include "common.h"
 
 using namespace cv;