[PATCH v5 0/7] MR6640: propsys: Support converting to BSTR for PropVariantToVariant.

[Ziqing Hui (＠zhui)]

This is based on top of !6526, will mark ready after !6526 is merged.

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  v5: DEBUG the gitlab CI test failure.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6640