LU-18522 utils: fix -export-dynamic flag

LU-18522 utils: fix -export-dynamic flag

When compiled with clang it fails with
`unknown argument: '-export-dynamic'`.
'-export-dynamic' is supported by gcc but not by clang.
Change to '-Wl,--export-dynamic' instead, which both supports.
-Wl, specifies the flags to be passed to the linker.

Signed-off-by: Sohei Koyama <skoyama@ddn.com>
Change-Id: I35830c0fec5387d532252478a402735ba2ad2dbf
Test-Parameters: trivial
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57334
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>