remove unused _USE_MATH_DEFINES, move others to the top

Author: ivikhrev

demos/gaze_estimation_demo/cpp/src/results_marker.cpp

@@ -2,11 +2,12 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+#define _USE_MATH_DEFINES
+
 #include "results_marker.hpp"
 
-#define _USE_MATH_DEFINES
-#include <cctype>
 #include <cmath>
+#include <cctype>
 #include <vector>
 
 #include <opencv2/core.hpp>

demos/gesture_recognition_demo/cpp_gapi/src/utils.cpp

@@ -16,8 +16,6 @@
 #include <ie_input_info.hpp>
 #include <ie_layouts.h>
 
-#define _USE_MATH_DEFINES
-
 cv::Scalar getNetShape(const std::string& path) {
     const auto network = InferenceEngine::Core{}.ReadNetwork(path);
     const auto layerData = network.getInputsInfo().begin()->second;

demos/gesture_recognition_demo/cpp_gapi/src/visualizer.cpp

@@ -2,8 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-#define _USE_MATH_DEFINES
-
 #include "visualizer.hpp"
 
 #include <algorithm>