[osx/depends] - add a fake Info.plist to target python26 for allowing codesign...

As of Mavericks the signing policy of app bundles has changed. 

From now on for being a valid bundle the structure of any private Frameworks in the bundle needs to match. Since we have Frameworks/lib/python2.6 in our bundle this is now treated as a Framework (with version 2.6) - but since python is no Framework this treatment fails and prevents the Firewall service to ad-hoc sign our app bundle (this leads to the firewall popup asking the user to allow incoming connections on each start of XBMC).

This PR fixes the problem by renaming the Frameworks folder to Libraries as suggested for raw dylibs in https://developer.apple.com/library/mac/technotes/tn2206/_index.html
I didn'T expect you to look outside the diff. I just told you why the code is how it is. Bikeshed?