[Issue 22553] New: ImportC: undefined identifier `__uint128_t`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22553

          Issue ID: 22553
           Summary: ImportC: undefined identifier `__uint128_t`
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dave287091 at gmail.com

Clang (and probably gcc as well) have an extension type of __uint128_t which is
a 128 bit unsigned integer. <stdlib.h> on macOS for arm64 transitively includes
a header that uses this type, leading to compilation failure.

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