Preprocessing inside {#offsetof #} {#sizeof #} etc

[valpackett]

linux/input.h uses defines to provide different public aliases for struct fields:

struct input_event {
#if (__BITS_PER_LONG != 32 || !defined(__USE_TIME_BITS64)) && !defined(__KERNEL__)
    struct timeval time;
#define input_event_sec time.tv_sec
#define input_event_usec time.tv_usec
#else
    __kernel_ulong_t __sec;
#if defined(__sparc__) && defined(__arch64__)
    unsigned int __usec;
#else
    __kernel_ulong_t __usec;
#endif
#define input_event_sec  __sec
#define input_event_usec __usec
#endif
    __u16 type;
    __u16 code;
    __s32 value;
};

Unfortunately it doesn't seem like c2hs wants to handle code like {#offsetof input_event->input_event_usec #}