[Mimedefang] Small update to fang.pl

[Eric Emerson]

The following two changes will allow fang.pl to reconstruct quarantined
messages with multiple parts.
Best,
Eric


[tmp]$ diff /usr/local/src/mimedefang-2.37/contrib/fang.pl.orig ./fang.pl
232c232
<         my $header = "$opts{'d'}/$dir/$_";
---
>         my $header = "$opts{'d'}/$dir/" . $part . "." . $idx. "." .
$piece;
234c234
<           || Error("Can't read $dir/$_: $!");
---
>           || Error("Can't read $header: $!");