[exim] New taint mismatch problems in exim 4.93

Hi,

unfortunately I see taint mismatch problems in 4.93 (HEAD of master¹)
again.

Using a redirect router:

    require_files = <; /file/system/path/${quote_local_part:$local_part}

    or

    file = /file/system/path/${quote_local_part:$local_part}

Error message for local_part "test":

test@??? cannot be resolved at this time: Tainted name '/file/system/path/test' for file read not permitted

$local_part is already checked in ACLs not containing unusual chars and not
starting with a dot.

Any idea?

Regards,
Heiko

¹ commit b273058

Heiko Schlichting                Freie Universität Berlin
heiko.schlichting@???   Zentraleinrichtung für Datenverarbeitung
Telefon +49 30 838-54327         Fabeckstraße 32
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