LU-14291 build: reduce obdclass code built for client

LU-14291 build: reduce obdclass code built for client

Several source files are built for the stand alone
lustre client that is never used. Lets not build
that code anymore.

Test-Parameters: trivial
Change-Id: I0af2cdd0c8aab450aced4c14251a02659143b036
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/23775
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>