libafscp: fix install/dest in sep. Objectdir

libafscp: fix install/dest in sep. Objectdir

When compiling libafscp in separate objdir,
make dest and make install fail, because of wrong
pathes. Fix it.

Reviewed-on: http://gerrit.openafs.org/4761
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 6af6a6a7cb497d4e255bed7ccf07a5db06d16b91)

Change-Id: I6aab1c62cc5f341628d4fdfe9aeac1293e37cf10
Reviewed-on: http://gerrit.openafs.org/5388
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Derrick Brashear <shadow@dementix.org>