reftable/system: provide thin wrapper for tempfile subsystem

We use the tempfile subsystem to write temporary tables, but given that
we're in the process of converting the reftable library to become
standalone we cannot use this subsystem directly anymore. While we could
in theory convert the code to use mkstemp(3p) instead, we'd lose access
to our infrastructure that automatically prunes tempfiles via atexit(3p)
or signal handlers.

Provide a thin wrapper for the tempfile subsystem instead. Like this,
the compatibility shim is fully self-contained in "reftable/system.c".
Downstream users of the reftable library would have to implement their
own tempfile shims by replacing "system.c" with a custom version.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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