updpkgsums: drop in-place rewrite hack, use a tempfile

This apparently exposes (what I think is) a subtle bug in cygwin's
handling of subst'd drives. Let's just drop the hackery and use a
tempfile, which should always work.

Also, introduce a proper die() function which replaces previous
hand-rolled error+exit pattern, but which wrote to stdout.

Signed-off-by: Allan McRae <allan@archlinux.org>

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