LU-12511 utils: fix regression for UAPI headers for native client

LU-12511 utils: fix regression for UAPI headers for native client

A patch landed to add wiretest for the GSS wire protocol which is
lacking for the native client. Add disabling the new test code
for the native Linux client build.

Test-Parameters: trivial
Fixes: 7dfbc71350 ("LU-9243 gss: fix GSS struct definition badness")
Change-Id: I31c387b757a77f4503b923c784911afc16c878a0
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/47803
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>