[GRASS-git] [OSGeo/grass] e8f26d: CI: Clean up OSGeo4W workflow scripts (#2675)

[Huidae Cho]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: e8f26dd6c3deb3c375c1dd973b60475d3cfba7ea
      https://github.com/OSGeo/grass/commit/e8f26dd6c3deb3c375c1dd973b60475d3cfba7ea
  Author: Huidae Cho <grass4u at gmail.com>
  Date:   2022-12-03 (Sat, 03 Dec 2022)

  Changed paths:
    M .github/workflows/build_osgeo4w.sh
    M mswindows/osgeo4w/build_osgeo4w.sh

  Log Message:
  -----------
  CI: Clean up OSGeo4W workflow scripts (#2675)

* build_osgeo4w.sh: Delete outdated usage

* Escape backslashes