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

[d-bugmail at puremagic.com]

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

          Issue ID: 23711
           Summary: compilable/testcstuff1.c:63:1: error: invalid use of
                    'restrict'
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

When compiling the test with `gcc -std=c11 -fsyntax-only`

compilable/testcstuff1.c:63:1: error: invalid use of ‘restrict’
   63 | _Static_assert(sizeof(const restrict volatile char volatile restrict
const) == 1, "ok");
      | ^~~~~~~~~~~~~~


Test content:
```
_Static_assert(sizeof(const restrict volatile char volatile restrict const) ==
1, "ok");
```

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