[Issue 22257] New: Add win32mscoff to the supported DISABLED tests in the test runner

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22257

          Issue ID: 22257
           Summary: Add win32mscoff to the supported DISABLED tests in the
                    test runner
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

This is so that test/runnable/bitfieldsdm.c can be run. Currently, it fails
because the Azure test runner tries throwing -mscoff32 at it, or even linking
with the MS libraries.

See https://github.com/dlang/dmd/pull/13034

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