Qt5 has the manifest files in QT_INSTALL_DOCS but the actual examples in
QT_INSTALL_EXAMPLES/DEMOS, which can be completely independent.
The patch tries to resolves files relative to the manifest, and if that
fails, relative to the install paths.

Change-Id: I7d449e1edab01f18680a5ffe6edcb508e7b194f6
Reviewed-by: hjk <qthjk@ovi.com>