fix(r/adbcbigquery,r/adbcflightsql,r/adbcsnowflake): fix warnings on R CMD check for Go-based drivers

[eitsupi]

Fix #3059 (Supersede #2708)

[eitsupi]

(I just wanted to make sure this solution works)

[eitsupi]

@paleolimbot As far as I can see the difference in the logs between adbcsnowflake (nothing) and adbcflightsql (changed), does this change seem to work well?

* checking compiled code ... WARNING
Warning: File ‘adbcsnowflake/libs/adbcsnowflake.so’:
  Found ‘abort’, possibly from ‘abort’ (C)
    Object: ‘go/libadbc_driver_snowflake.a’
  Found ‘stderr’, possibly from ‘stderr’ (C)
    Object: ‘go/libadbc_driver_snowflake.a’

https://github.com/apache/arrow-adbc/actions/runs/15954167507/job/44998244253?pr=3061

 * checking compiled code ... OK

https://github.com/apache/arrow-adbc/actions/runs/15954167507/job/44998244254?pr=3061

[paleolimbot]

This works for me!

[paleolimbot]

Thanks for fixing this properly! This particular CRAN rule is I think one of their worst additions to date (actively making it harder to package useful libraries to R 🙁 ). Just one optional request to document why we need the extra makefile target but in general this looks great!

[paleolimbot]

Can you add a note (here and to the other files) about why we have to do this? (Mostly so I don't forget the next time I look here 😬 )

[eitsupi]

How about 9c63bfa?

[eitsupi]

This is a side note, but I noticed that only adbcsnowflake does not have Makevars.win.
Can we remove Makevars.win from drivers other than adbcsnowflake? Or, we should add that file to adbcsnowflake?

[paleolimbot]

Thank you!

[paleolimbot]

Can we remove Makevars.win from drivers other than adbcsnowflake?

Yes, we can. The Go drivers don't build without the UCRT R versions (although I think Snowflake did at one point, hence the file).