Honor $TEMP
and friends when generating anonymous handles
#43515
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On Darwin, when generating anonymous handles, we hardcoded
/tmp
as thebeginning path, but that's bad behavior if the user has explicitly
requested (via setting
$TEMP
or$TEMPDIR
, etc...) that we not do so.Let's use
uv_os_tmpdir()
to put things in the correct place as much aswe can, defaulting to
/tmp
if anything goes wrong inside of libuv.