[Issue 23711] compilable/testcstuff1.c:63:1: error: invalid use of 'restrict'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23711

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Another test that fails to compile.

compilable/testcstuff1.c:260:5: error: invalid use of ‘restrict’
  260 |     int (* const volatile restrict fp2)(void);
      |     ^~~


```
int (* const volatile restrict fp2)(void);
```

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