[Bug target/88521] GCC from r266355 miscompiles x265 for mingw-w64 target

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88521
Bug 88521 depends on bug 85667, which changed state.

Bug 85667 Summary: ms_abi rules aren't followed when returning and passing short structs with float and double values
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85667

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED