Rename Mat::clone binding because it is used in Emscripten.

This is in emscripten 3.1.71 and above, cf
emscripten-core/emscripten#22734
There was a temptative fix upstream to no avail:
emscripten-core/emscripten#23132

Author: vrabaud

modules/js/src/core_bindings.cpp

@@ -524,7 +524,7 @@ EMSCRIPTEN_BINDINGS(binding_utils)
         .function("colRange", select_overload<Mat(int, int)const>(&cv::Mat::colRange))
         .function("colRange", select_overload<Mat(const Range&)const>(&cv::Mat::colRange))
         .function("step1", select_overload<size_t(int)const>(&cv::Mat::step1))
-        .function("clone", select_overload<Mat()const>(&cv::Mat::clone))
+        .function("mat_clone", select_overload<Mat()const>(&cv::Mat::clone))
         .function("depth", select_overload<int()const>(&cv::Mat::depth))
         .function("col", select_overload<Mat(int)const>(&cv::Mat::col))
         .function("dot", select_overload<double(const Mat&, const Mat&)>(&binding_utils::matDot))

modules/js/test/test_mat.js

@@ -173,7 +173,7 @@ QUnit.test('test_mat_creation', function(assert) {
     //   clone
     {
         let mat = cv.Mat.ones(5, 5, cv.CV_8UC1);
-        let mat2 = mat.clone();
+        let mat2 = mat.mat_clone();
 
         assert.equal(mat.channels, mat2.channels);
         assert.equal(mat.size().height, mat2.size().height);