... and make use of it in qt.prf.
[ChangeLog][qmake][Unix] Added support for relative paths in
QMAKE_RPATHDIR.
Note that this technically breaks backwards compatibility, as relative
paths were previously silently resolved against $$_PRO_FILE_PWD_. This
was not documented and seems rather useless, so i'm not worried.
Change-Id: I855042a8962ab34ad4617899a5b9825af0087f8a
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
Reviewed-by: Jake Petroules <jake.petroules@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>