Exporting float_to_shortest_decimal_buf(n) with Postgres 17 on Windows

[Andrew Kane]

Hi,

With Postgres 17 RC1 on Windows, `float_to_shortest_decimal_buf` and
`float_to_shortest_decimal_bufn` are not longer exported. This causes
`unresolved external symbol` linking errors for extensions that rely on
these functions (like pgvector). Can these functions be exported like
previous versions of Postgres?

Thanks,
Andrew