3373 gcc >= 4.5 concerns about offsetof()

*** 328,338 ****
--- 328,342 ----
  #define USB_AS_PLUMBED  1
  #define USB_AH_PLUMBED  2
  #define UNKNOWN_PLUMBED 3
  
  /* other useful macros */
+ #if defined(__GNUC__)
+ #define offsetof(s, m)  __builtin_offsetof(s, m)
+ #else
  #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
+ #endif