Fix windows compilation

Path concatenation was wrong. Layout path was received as full path
and was concatenated to script directory path

Fix: do not prepend script directory path in case full path is received.

Issue reproduced on MSYS2

Change-Id: I5f627b5befcc56f4487dbfaaa1e2d9e1dd655103
Signed-off-by: Alexander Zilberkant <alexander.zilberkant@arm.com>
2 files changed