[RN] Allow share-room ToolbarButton to not be rendered

react/features/toolbox/components/Toolbox.native.js

 import styles from './styles';
 import ToolbarButton from './ToolbarButton';
 
+/**
+ * The indicator which determines (at bundle time) whether there should be a
+ * {@code ToolbarButton} in {@code Toolbox} to expose the functionality of the
+ * feature share-room in the user interface of the app.
+ *
+ * @private
+ * @type {boolean}
+ */
+const _SHARE_ROOM_TOOLBAR_BUTTON = true;
+
 /**
  * Implements the conference toolbox on React Native.
  */
                     onClick = { this.props._onToggleAudioOnly }
                     style = { style }
                     underlayColor = { underlayColor } />
-                <ToolbarButton
-                    iconName = 'link'
-                    iconStyle = { iconStyle }
-                    onClick = { this.props._onShareRoom }
-                    style = { style }
-                    underlayColor = { underlayColor } />
+                {
+                    _SHARE_ROOM_TOOLBAR_BUTTON
+                        && <ToolbarButton
+                            iconName = 'link'
+                            iconStyle = { iconStyle }
+                            onClick = { this.props._onShareRoom }
+                            style = { style }
+                            underlayColor = { underlayColor } />
+                }
             </View>
         );