Use of FileFixifyAbsolute with non-default in_dir and out_dir
is not defined (and produces bogus results).
Using FileFixifyRelative when handling QMAKE_BUNDLE_DATA as a relative
path is fine.
Change-Id: I49902dc9f5b8029d092a4419c0cff5483e419c30
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>