[R-package] Use Rf_
-prefixed versions of protect/unprotect
#6502
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From similar PR in XGBoost: dmlc/xgboost#10465
This PR modifies the R C-level function code to call the versions of protect/unprotect that have
Rf_
prefixes. This is currently not required by CRAN as their non-Rf equivalentsPROTECT
/UNPROTECT
are simple defines aliasing toRf_protect
/Rf_unprotect
, but the situation might change in the future.