Support appstore compliancy switch from the new configure system

Change-Id: Ic7768d9b2677ed488d6af05f34942321b670671e
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Michal Klocek <michal.klocek@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/core/config/mac_osx.pri

@@ -40,6 +40,8 @@ use?(gn) {
         macos: gn_args += use_browser_spellchecker=false
     }
 
+    use?(appstore_compliant_code): gn_args += appstore_compliant_code=true
+
 } else {
     GYP_CONFIG += \
         qt_os=\"mac\" \

src/webengine/doc/src/qtwebengine-platform-notes.qdoc

@@ -116,11 +116,7 @@
 
     By default, Qt WebEngine uses private \macos API, which might cause an application to be
     rejected when submitted to the Mac App Store. To configure Qt WebEngine not to use these API
-    calls, Qt WebEngine has to be recompiled:
-
-    \code
-    qmake WEBENGINE_CONFIG+=use_appstore_compliant_code
-    \endcode
+    calls, Qt has to be reconfigured with the \c -appstore-compliant switch.
 
     However, this will cause some behavioral changes, such as: