[xiphos-source] [crosswire/xiphos] bf6ac2: Use pre-built MinGW Biblesync package (#1016)

[Greg Hellings]

  Branch: refs/heads/master
  Home:   https://github.com/crosswire/xiphos
  Commit: bf6ac2e12258b293c37a7d37b7034723b3e6251c
      https://github.com/crosswire/xiphos/commit/bf6ac2e12258b293c37a7d37b7034723b3e6251c
  Author: Greg Hellings <greg.hellings at gmail.com>
  Date:   2020-05-01 (Fri, 01 May 2020)

  Changed paths:
    M .github/workflows/builds.yml
    M win32/WindowsBuildNotes.txt
    M win32/xc-xiphos-win.sh

  Log Message:
  -----------
  Use pre-built MinGW Biblesync package (#1016)