darwin: clamp video width to 1024 instead of 960
darwin: disable font border loading for laggy subtitles on darwin platforms
darwin: suppress "32-bit absolute address out of range" warning
Credit:
  https://github.com/kivy/kivy-ios/commit/0062353c5812b893d6d4bcc97eb221cd782a298c
darwin: fix backrow header missing issue
darwin: customize build