Philip Withnall 67a589e505 gsubprocess: Use new source/target FD mapping functionality in g_spawn()
This improves performance by eliminating the use of a
`GSpawnChildSetupFunc` in the common case (since that setup code has now
moved into `g_spawn*()` itself), and enables the use of the fix to avoid
the child error reporting FD being overwritten by target FD mappings,
introduced via `g_spawn_async_with_pipes_and_fds()`.

It reworks how the source/target FD mapping is stored within
`GSubprocessLauncher` to match what `g_spawn*()` uses. The two
approaches are equivalent.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Fixes: #2097
2021-02-16 13:44:00 +00:00
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