[glib] (6 commits) Non-fast-forward update to branch mcatanzaro/posix-spawn2

[Michael Catanzaro <mcatanzaro src gnome org>]

The branch 'mcatanzaro/posix-spawn2' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  7628517... gspawn: Implement fd remapping for posix_spawn codepath
  854eb12... gsubprocess: ensure we test fd remapping on the posix_spawn
  1897b5c... gspawn: Check from errors from safe_dup2() and dupfd_cloexe
  8b7c88e... gspawn: add new error message for open() failures
  67f93f5... Add tests for GSubprocess fd conflation issues
  bef82b2... Add test for child_err_report_fd conflation with target fds

Commits added to the branch:

  e361a53... gspawn: Implement fd remapping for posix_spawn codepath
  bfeed11... gsubprocess: ensure we test fd remapping on the posix_spawn
  fd2e920... gspawn: Check from errors from safe_dup2() and dupfd_cloexe
  05a8ad8... gspawn: add new error message for open() failures
  de9a2ec... Add tests for GSubprocess fd conflation issues
  bcec353... Add test for child_err_report_fd conflation with target fds