[PATCH, fortran] Fix simple typo in libgfortran

[Yuao Ma]

Hi Thomas,

Thanks for your quick response.

> There should be a ChangeLog entry. You can generate a template by
> running your patch through contrib/mklog.py, which you can then fill
> out with the details.

I think the ChangeLog entry is already in the patch. I used
git gcc-commit-mklog, and it produced the following:

```
libgfortran/ChangeLog:

   * io/read.c: typo fix, explict -> explicit
```

Is this sufficient, or does it need more detail?

Yuao

0001-Fix-simple-typo-in-libgfortran.patch
Description: 0001-Fix-simple-typo-in-libgfortran.patch