RE: lib/fnmatch.c: mistakes `char32_t` rather than `wchar_t` on Windows

[YX Hao]

Hi,

> `c32*.c` files are newly included, but `uc_is_*` functions are not
The 2nd error also has gone with a newer gnulib commit 92cdf62b,
which is merged from the head of wget, using a hack of:
```
sed -i "s/!_GL_SMALL_WCHAR_T/defined _GL_SMALL_WCHAR_T/" lib/fnmatch.c
```
https://github.com/lifenjoiner/wget-for-windows/actions/runs/9875390451

Best Regards,
YX Hao