[PATCH v4 0/4] MR3073: Implement FileDispositionInformationEx and FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE

[Joel Holdsworth (＠jhol)]

This MR supercedes !1895 as a solution to bug [#50771](https://bugs.winehq.org/show_bug.cgi?id=50771). Rather than fixing the problem of Wine's inability to modify the attributes of read-only files, this patch set instead implements `FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE` which the Msys2 and Cygwin runtime libriries can use to avoid needing to modify attributes.

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  v4: ntdll: Implemented FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
      ntdll/tests: Added tests for FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
      ntdll: Initial implementation of FileDispositionInformationEx
      include: Defined FILE_DISPOSITION_INFORMATION_EX and friends

https://gitlab.winehq.org/wine/wine/-/merge_requests/3073