make sure applications/xbmc.desktop does'nt have executable flag

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
[release] version bump to 13.2alpha1
Merge pull request #4848 from MartijnKaijser/13.2b1

13.2alpha1
Merge pull request #4796 from BlackIkeEagle/Gotham-non-exec-desktop

Gotham non exec desktop
Merge branch 'Gotham' of https://github.com/xbmc/xbmc into Gotham