Typo in libstdc++-v3/configure

[Billinghurst, David (CRTS)]

There is a typo the libstdc++-v3/configure wchar function tests
(at around line 4752).  The test for fwgetc is repeated, which is
harmeless unless something was missed out.

  


        for ac_func in btowc wctob fgetwc fgetwc fgetws fputwc fputws fwide \
    fwprintf fwscanf swprintf swscanf vfwprintf vfwscanf vswprintf vswscanf \
    vwprintf vwscanf wprintf wscanf getwc getwchar mbsinit mbrlen mbrtowc \
    mbsrtowcs wcsrtombs putwc putwchar ungetwc wcrtomb wcstod wcstof wcstol \
    wcstoul wcscpy wcsncpy wcscat wcsncat wcscmp wcscoll wcsncmp wcsxfrm \
    wcscspn wcsspn wcstok wcsftime wcschr wcspbrk wcsrchr wcsstr
do
echo $ac_n "checking for $ac_func""... $ac_c" 1>&6