GH-44018: [R] Treat builds on R-universe as like NOT_CRAN=true
#44476
+3
−1
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Rationale for this change
R-universe mimics CRAN's behavior quite well, but unlike CRAN, it does not reject external binary downloads.
So allowing automatic download of libarrow binaries on R-universe may reduce CI run time on R-universe.
What changes are included in this PR?
Change to attempt to download libarrow binaries on R-universe.
Are these changes tested?
No.
Are there any user-facing changes?
No.
NOT_CRAN
#44018