Revert "Add support for non-ascii filenames when uploading files using multipart/form-data (#1175)"
Revert "Add support for non-ascii filenames when uploading files using multipart/form-data (#1175)"

Non-ASCII filenames were already supported.

This reverts commit eb7b4255d69c935103e044b32b3a046c288d96e6.

fkazimierczak/werkzeug,pallets/werkzeug,pallets/werkzeug,pallets/werkzeug,fkazimierczak/werkzeug,fkazimierczak/werkzeug,mitsuhiko/werkzeug,mitsuhiko/werkzeug