[R-package] remove xlen_t in custom R-to-C++ interface #3223
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This PR is a step towards #3016 . Now that we are comfortable using R's provided headers in the R package, we can start to factor out custom things to reduce the maintenance burden for the R package.
This replaces
xlen_t
withR_xlen_t
fromRinternals.h
.You can see the implementation at https://github.com/wch/r-source/blob/trunk/src/include/Rinternals.h#L71-L82