[R-sig-Debian] LTO flags in 4.1.0 Ubuntu 21.04 Makeconf

[Dirk Eddelbuettel]

Two more follow-ups if I may:

- the Debian and hence derived Ubuntu package of R 4.1.0 does *not* enable
  LTO yet, in other words I have not yet add --enable-lto to the configure
  call and we use to default of 'nope'
- my dev box is still 20.10; I only run 21.04 on one small machine where I
  have not tried to build arrow; but under 20.10 + R 4.1.0 + arrow 4.0.? the
  two step dance that they force on us works

Dirk

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