LU-14706 libcfs: ___wait_event() update for older kernels

LU-14706 libcfs: ___wait_event() update for older kernels

A couple of wait issues fail to build correctly on older
3.0 kernels

Fixes: f6df31a163 ("LU-10467 lustre: add wait_event macros suitable for upstream")
Fixes: d05427a785 ("LU-10428 lnet: call event handlers without res_lock")
HPE-bug-id: LUS-9975
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I275fbf79c4472575d867075a3e3ebd3d6ec1cdfa
Reviewed-on: https://review.whamcloud.com/43785
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>