add LEGIC decoder (submitted by Sourcerer, untested by me)

[proxmark3-svn] / include / legic_prng.h

#include "unistd.h"
#include "stdint.h"
extern void legic_prng_init(uint8_t init);
extern void legic_prng_forward(int count);
extern uint8_t legic_prng_get_bit();