Merge remote-tracking branch 'upstream/3.4' into merge-3.4

doc/js_tutorials/js_setup/js_nodejs/js_nodejs.markdown

@@ -232,7 +232,7 @@ The following is an adaptation of @ref tutorial_js_face_detection.
 @code{.js}
 const { Canvas, createCanvas, Image, ImageData, loadImage } = require('canvas');
 const { JSDOM } = require('jsdom');
-const { writeFileSync, readFileSync } = require('fs');
+const { writeFileSync, existsSync, mkdirSync } = require('fs');
 
 (async () => {
   await loadOpenCV();

modules/core/src/system.cpp

@@ -604,13 +604,20 @@ struct HWFeatures
             close(cpufile);
         }
     #endif
-    #elif (defined __clang__ || defined __APPLE__)
+    #elif (defined __APPLE__)
     #if (defined __ARM_NEON__ || (defined __ARM_NEON && defined __aarch64__))
         have[CV_CPU_NEON] = true;
     #endif
     #if (defined __ARM_FP  && (((__ARM_FP & 0x2) != 0) && defined __ARM_NEON__))
         have[CV_CPU_FP16] = true;
     #endif
+    #elif (defined __clang__)
+    #if (defined __ARM_NEON__ || (defined __ARM_NEON && defined __aarch64__))
+        have[CV_CPU_NEON] = true;
+        #if (defined __ARM_FP  && ((__ARM_FP & 0x2) != 0))
+        have[CV_CPU_FP16] = true;
+        #endif
+    #endif
     #endif
     #if defined _ARM_ && (defined(_WIN32_WCE) && _WIN32_WCE >= 0x800)
         have[CV_CPU_NEON] = true;