fix Info.plist location in framework bundles

According to Apple's documentation [1], framework bundles don't
have a 'Contents' folder. Instead, each version folder gets a
'Resources' folder which contains the Info.plist file, and which
is also symlinked at the top-level framework folder.

[1]: https://developer.apple.com/library/mac/documentation/macosx/conceptual/BPFrameworks/Concepts/FrameworkAnatomy.html



Task-number: QTBUG-32895
Change-Id: I5e55cc097b179012add0ceb7c567dace8e282895
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>