[Bug 51051] wine-staging 6.7 64 bit build fails in Ubuntu 21.04

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51051

--- Comment #1 from Zebediah Figura  ---
What version of gcc is this?

It looks like it's choking on the declaration of e.g. cptable950; we declare it
as "extern union cptable" and define it as "const struct dbcs_table". I don't
know whether that's valid C.

I also have no idea why this would only fail for wine-staging, there shouldn't
be any code affecting that.