PsychtoolboxKernelDriver64BitLegacy.kext.zip: Restore to September 2013 state for OSX < 10.8 compat.

I can only build new versions of the driver for 10.8 and later - at
best.
Restore the legacy driver for 10.6 and 10.7 to the state of September
2013, the best we can do.
-> 10.6 and 10.7 will be permanently broken wrt. digital display
dithering on AMD pre-HD5000 hardware.