message: Adjust stddef.h to be compatiable with other libc(s)
  I faced many issues when compiling libstdC++-V3 and linking against
  relibc mainly:
  Missing types (max_align_t)
  Different types definitions(ptrdiff_t , size_t)
  and the fact that wchar_t is part of standard C++ and it seams that we
  canno redefine standard types
diff: #define NULL 0
  -typedef signed long long ptrdiff_t;
  +#ifndef __PTRDIFF_TYPE__
  +#define __PTRDIFF_TYPE__ long int
  +#endif
  +typedef __PTRDIFF_TYPE__ ptrdiff_t;
  +#ifndef __cplusplus
  typedef int32_t wchar_t;
  +#endif /* #ifndef __cplusplus */
  typedef int32_t wint_t;
  -typedef unsigned long long size_t;
  +
  +typedef long unsigned int size_t;
  +
  +typedef struct { long long __ll; long double __ld; } max_align_t;
  #define offsetof(type, member) __builtin_offsetof(type, member)
  