[Toybox] [PATCH] macOS: silence the "vfork() is deprecated" warning spam.

[enh]

This was the resolution from the discussion on mailing list; basically
"if Apple does remove vfork(), things will break quite obviously,
and we'll deal with it then".

The apparent alternative mentioned on the mailing list of setting
_POSIX_C_SOURCE doesn't work, because that *removes* the declaration
of chroot().

---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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