In some Win10 testbot images (notably jp and cn), we can get a spurious
layout change after creating the test window. Detect this and skip the
tests since the test expectations (e.g., wchar mappings) are now
invalid.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/5652
The `-Wstringop-overread` fix feels a bit questionable (so I'll add Eric as a
reviewer to clarify the MSC structs details)
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v3: winedump: Fail on NULL funcs in dump_dir_exceptions().
winedump: Use offsetof() for string position calculations.
https://gitlab.winehq.org/wine/wine/-/merge_requests/5625