Fix dumping variables of absolute paths.

Calling $(abspath) is better than checking and prepending $(PWD) if
necessary.

Bug: 27429759
Change-Id: Ia156f8a5d6b88b6090f4d23c7f9166bd62d3ab70
(cherry-pick from commit 80ceadc94526d6c48c0022bf25281bb522914a3d)
1 file changed