Don't try to deploy the mng image format plugin on macOS

Qt now only build it if the system library is available since libmng
isn't active enough to make its security reliable enough. We don't
use that image format ourselves anyway.

diff --git a/admin/osx/macdeployqt.py b/admin/osx/macdeployqt.py
index 6c1d241dbfe0cf7c66c632b799162a4e575289f8..f27eead38b612e0aadeac1cb14850b45d7bc39cd 100755 (executable)
--- a/admin/osx/macdeployqt.py
+++ b/admin/osx/macdeployqt.py
@@ -40,7 +40,6 @@ QT_PLUGINS = [
     'imageformats/libqico.dylib',
     'imageformats/libqjpeg.dylib',
     'imageformats/libqsvg.dylib',
-    'imageformats/libqmng.dylib',
 ]
 
 QT_PLUGINS_SEARCH_PATH=[