EX-9588 lipe: lipe_scan3 compatibility for EXA5.2.8

EX-9588 lipe: lipe_scan3 compatibility for EXA5.2.8

Add a compatibility implementation of llapi_layout_compress_get()
so lipe_scan3 can run on EXA5.2.8 that has an old liblustreapi.so
without this function.

Test-Parameters: trivial testlist=sanity-lipe-scan3,sanity-lipe-find3
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I7de9164467ea889ee2d47c7fbb18bfd7acce7057
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54924
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>