Bug#961205: winetricks: cannot isntall font the download of PowerPointViwer.exe hans with server down

[Bernhard Übelacker <bernhardu@mailbox.org>]

Dear Maintainer,
if a targetted fix for buster would be desired, following
upstream commits seem to be the last changes to the
download URL in question.
  https://github.com/Winetricks/winetricks/commit/ac51cdb pptfonts: use a helper function
  https://github.com/Winetricks/winetricks/commit/76f5fdf calibri, cambria, candara, consolas, constantia, corbel, meiryo: update URL

Upstream issue:
  https://github.com/Winetricks/winetricks/issues/1540

The version 0.0+20200412-1 in unstable seems to be affected too.

Kind regards,
Bernhard