[glib] (15 commits) ...Merge branch '2097-spawn-fd-rewriting' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  12a627b... gspawn: Reindent some arguments
  63467c5... gspawn: Remove spurious blank lines
  cddcd24... gspawn: Combine fork_exec() implementations
  7be9767... gspawn: Handle arbitrary FD passing and renumbering between
  f20f0d3... gspawn: Avoid custom FDs conflicting with the child_err_rep
  c5f3ba7... gspawn: Avoid merged FDs being closed on exec()
  52dc7cb... tests: Add setlocale() call to spawn-singlethread
  b31f3f5... gspawn: Add new g_spawn_async_with_pipes_and_fds() API
  67a589e... gsubprocess: Use new source/target FD mapping functionality
  fd0b20d... gspawn: Minor improvements to documentation formatting
  ba40390... gspawn-win32: Rename a variable for consistency with the pu
  a34b674... gspawn-win32: Refactor internal spawn functions
  ea9fd4c... gspawn-win32: Implement g_spawn_async_with_pipes_and_fds()
  eebb662... gspawn-win32: Various minor internal const-correctness fixe
  51e9648... Merge branch '2097-spawn-fd-rewriting' into 'master'