[libstdc++] Don't access fpos_t.__state on uClibc w/o wchar support

[Gabriel Dos Reis]

Bernardo Innocenti <bernie@develer.com> writes:

| Don't access __state member of fpos_t when building on uClibc with
| wchar support disabled.

|  +#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_WCHAR__)

Why can't you use the standard idiom

  #if _GLIBCXX_USE_WCHAR_T

?

-- Gaby