COMPMID-1685: Allow build_dir to be an absolute path

Change-Id: I875ffe0ccec3aa4f53bfb68d82e2a7292ab83358
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/155348
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: bsgcomp <bsgcomp@arm.com>
2 files changed