gcc: fix patch format

gcc: fix patch format

This is the only gcc patch which doesn't work with git am:

```
git am gcc-15.2.0-r0/sources/*.patch
...
Applying: Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
fatal: empty ident name (for <>) not allowed
```

Signed-off-by: Etienne Cordonnier <ecordonnier@snap.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>