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67bbf846 - GH-41952: [R] Turn S3 and ZSTD on by default for macOS (#42210)

GH-41952: [R] Turn S3 and ZSTD on by default for macOS (#42210) Changeup `nixlibs.R` so that we enable S3 and ZSTD by default on CRAN. I've checked this against the CRAN macbuilder to confirm it does work (that's not a guarantee it'll work on other CRAN maintained macOS builders, but a good indication). It also removes gcs from the list of features we expect to be on and warn folks about if it is not. ### Rationale for this change So that our builds are more fully featured. ### What changes are included in this PR? Enable `ARROW_S3` by default when building form source on macOS. ### Are these changes tested? Existing CI should not fail. ### Are there any user-facing changes? Getting Arrow from the canonical repository would be more fully featured. * GitHub Issue: #41952 Lead-authored-by: Jonathan Keane <jkeane@gmail.com> Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com> Signed-off-by: Jonathan Keane <jkeane@gmail.com>