Create output host library directory if needed

The directory where to generate output may not exists leading
generation to failure.

This patch adds the directory creation and thus makes sure generation
won't fail for this reason.

Change-Id: I1cee75d6d7921315dc3a928245499bde447c3639
Tracked-On: https://jira01.devtools.intel.com/browse/IMINAN-19676


Signed-off-by: Sebastien Gonzalve <sebastien.gonzalve@intel.com>