[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:

  0330e30... gspawn: Implement fd remapping for posix_spawn codepath
  fd61aa0... gsubprocess: ensure we test fd remapping on the posix_spawn
  bd0405a... gspawn: Check from errors from safe_dup2() and dupfd_cloexe
  954884c... gspawn: add new error message for open() failures
  46df766... Add tests for GSubprocess fd conflation issues
  c0deaa3... Add test for child_err_report_fd conflation with target fds

Commits added to the branch:

  b2044c5... gspawn: Implement fd remapping for posix_spawn codepath
  b2bf69d... gsubprocess: ensure we test fd remapping on the posix_spawn
  45fe9fa... gspawn: Check from errors from safe_dup2() and dupfd_cloexe
  0f8d3f7... gspawn: add new error message for open() failures
  4a92bec... Add tests for GSubprocess fd conflation issues
  e4908e8... Add test for child_err_report_fd conflation with target fds