libadmin: separate source and header compile_et rules

Use the new compile_et -emit option to generate source
and header files separately for parallel make support.

Remove unneed -h options, since there are no prolog
files and the header names match the error table names.

Reviewed-on: http://gerrit.openafs.org/10730
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: D Brashear <shadow@your-file-system.com>
(cherry picked from commit e97198372a8ddbdba4b5a58c0659f2aa5d2b2d56)

Change-Id: Ic8da7c3dea7953cb7ad33120df06ec1f7399bf2d
Reviewed-on: http://gerrit.openafs.org/11238
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>