LU-12511 lnet: don't build gnilnd related code for native client

LU-12511 lnet: don't build gnilnd related code for native client

The gnilnd is not upstream so avoid the code for native client
builds.

Test-Parameters: trivial
Change-Id: I48015da55f2ea8823838a00ca618c9bd1716b7c3
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58953
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>