Add POL_Config_Win16 to check if the host can run win16 programs

http://linux-kernel.2935.n7.nabble.com/tip-x86-urgent-x86-64-modify-ldt-
Ban-16-bit-segments-on-64-bit-kernels-td838675i120.html

http://www.playonlinux.com/en/app-1726-GOGcom__Caesar_III.html

(untested)