[OpenSmalltalk/opensmalltalk-vm] aaaa4b: Retry download cygwin setup 4x with curl

 
  Branch: refs/heads/compile_sista_with_clang
  Home:   https://github.com/OpenSmalltalk/opensmalltalk-vm
  Commit: aaaa4b1e8c1fb5448ea45856479cc51c60324b26
      https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/aaaa4b1e8c1fb5448ea45856479cc51c60324b26
  Author: Nicolas Cellier <[hidden email]>
  Date:   2018-04-02 (Mon, 02 Apr 2018)

  Changed paths:
    M .appveyor.yml

  Log Message:
  -----------
  Retry download cygwin setup 4x with curl

-m 600 means don't spend more than 10 minutes (600 seconds) see curl manual https://curl.haxx.se/docs/manpage.html
This was taken from appveyor docs https://www.appveyor.com/docs/how-to/download-file/