Description of problem:
The x86_64 build of unshield is completely broken and unusable.  It always
reports an MD5 checksum failure for every single file in every cabinet you
attempt to extract or test.

Version-Release number of selected component (if applicable):
unshield-0.5-3.fc5

How reproducible:
Attempt to extract or test any InstallShield cabinet using unshield

Actual results:
unshield will report an MD5 checksum failure for every single file in the
cabinet, and fail to extract the files

Expected results:
MD5 checksum failures should only occur if the cabinet is actually damaged

Additional info:
Googling for "unshield md5", I came across this:

http://ports.openbsd.nu/archivers/unshield

Note the commit dated 2006-10-18.  Apparently, unshield contains its own
implementation of md5 which is not 64-bit-clean code.  The OpenBSD package
maintainer fixed the issue by making unshield use the system md5 (OpenBSD has
md5 in their libc) instead of its own implementation.  We don't have that
luxury, so it looks like we'll have to actually fix unshield's md5 (or rip it
out and replace it with the one from coreutils, but I don't think they're
license compatible)