des: generated files should not require objects needed in libdes

des: generated files should not require objects needed in libdes

1.6 only change, since DES is dead. don't require the same misc.o
in both libdes and when generating generated files to making, as
make dependencies then throw away valid input.

Change-Id: Icf6a211e66d7390ac73fa1effb89a0c4a131666f
Reviewed-on: http://gerrit.openafs.org/4713
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>