libcrypto/ui: mechanically rename the union _ into u

While mainstream OS use compilers that understand anonymous unions, which
would be cleaner here, some special snowflakes rely on LibreSSL in their
stacks and they sometimes use very old and special compilers. There is no
need to impose a burden on them. There is far more impactful and important
cleanup that could be done in the ui pit.

This obviates jsg's upcoming removal of a windows-ce workaround.

discussed with jsing

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