Signed-off-by: Daniel Lehman <dlehman25(a)gmail.com>
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v2: kernelbase: Pass va_list copy to internal RtlFormatMessage.
kernel32/tests: Test if FormatMessage modifies va_list on error.
ntdll/tests: Test if RtlFormatMessage modifies va_list on error.
https://gitlab.winehq.org/wine/wine/-/merge_requests/187