LU-12282 build: export IB_OPTIONS before build

LU-12282 build: export IB_OPTIONS before build

We need to export any option before dpkg-buildpackage

Test-Parameters: trivial

Lustre-change: https://review.whamcloud.com/34843
Lustre-commit: eb70bc0b63a6aae50c7b9ab9fc84b6b0e090428d

Change-Id: I683080e1872c8818ae9c391f5971b5e4488147a6
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Gu Zheng <gzheng@ddn.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34928
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>