Commit [c87381] 3.1 Maximize Restore History

Refinement by Stefan Krah (see issue 11715, msg133194) to exit early if the

dpkg-architecture command is not found on $PATH. This should fix the failures
on FreeBSD and Solaris, which do not create the target file via I/O
redirection if the command isn't found (unlike Linux and OS X which do).

Barry Warsaw Barry Warsaw 2011-04-07

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