fix(RTCUtils) Return false for device change checks on mobile Safari.

JitsiMediaDevices.js

     }
 
     /**
-     * Returns true if it is possible to be simultaneously capturing audio
-     * from more than one device.
+     * Returns true if it is possible to be simultaneously capturing audio from more than one device.
      *
      * @returns {boolean}
      */
     isMultipleAudioInputSupported() {
-        return !browser.isFirefox();
+        return !(browser.isFirefox() || browser.isIosBrowser());
     }
 
     /**

modules/RTC/RTCUtils.js

      * @returns {boolean} true if available, false otherwise.
      */
     isDeviceChangeAvailable(deviceType) {
-        return deviceType === 'output' || deviceType === 'audiooutput'
-            ? isAudioOutputDeviceChangeAvailable
-            : true;
+        if (deviceType === 'output' || deviceType === 'audiooutput') {
+            return isAudioOutputDeviceChangeAvailable;
+        }
+
+        // Calling getUserMedia again (for preview) kills the track returned by the first getUserMedia call because of
+        // https://bugs.webkit.org/show_bug.cgi?id=179363. Therefore, do not show microphone/camera options on mobile
+        // Safari.
+        if ((deviceType === 'audioinput' || deviceType === 'input') && browser.isIosBrowser()) {
+            return false;
+        }
+
+        return true;
     }
 
     /**