Added an upper bound to gnutls versions.
Added an upper bound to gnutls versions.

libimobiledevice-win32/libplist,Tatsh/libplist,Tatsh/libplist,libimobiledevice-win32/libimobiledevice,libimobiledevice-win32/libplist,Tatsh/libplist,Tatsh/libimobiledevice,libimobiledevice-win32/libplist,kalev/libimobiledevice,libimobiledevice-win32/libimobiledevice,libimobiledevice-win32/libimobiledevice,patweb/libimobiledevice,kalev/libimobiledevice,upbit/libimobiledevice,libimobiledevice-win32/libplist,libimobiledevice/libimobiledevice,libimobiledevice/libplist,libimobiledevice/libimobiledevice,upbit/libimobiledevice,Tatsh/libimobiledevice,Tatsh/libimobiledevice,libimobiledevice/libplist,patweb/libimobiledevice,Tatsh/libplist,Tatsh/libimobiledevice,patweb/libimobiledevice,libimobiledevice/libplist,libimobiledevice-win32/libimobiledevice,upbit/libimobiledevice,kalev/libimobiledevice