iOS: Suppress a compiler warning

modules/juce_gui_basics/native/juce_ios_FileChooser.mm

@@ -414,11 +414,13 @@ std::shared_ptr<FileChooser::Pimpl> FileChooser::showPlatformDialog (FileChooser
     return self;
 }
 
+JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-implementations")
 - (void) documentPicker: (UIDocumentPickerViewController*) controller didPickDocumentAtURL: (NSURL*) url
 {
     if (owner != nullptr)
         owner->didPickDocumentAtURL (url);
 }
+JUCE_END_IGNORE_WARNINGS_GCC_LIKE
 
 - (void) documentPicker: (UIDocumentPickerViewController*) controller didPickDocumentsAtURLs: (NSArray<NSURL*>*) urls
 {