Log Message:
(devel/R-xfun) Updated 0.36 to 0.37

# CHANGES IN xfun VERSION 0.37

- Added a function `is_arm64()` to test the CPU type (thanks, @AlbanSagouis, #72).

- Started deprecating `xfun::isFALSE()` in favor of `base::isFALSE()`
  for R >= 3.5.0 (thanks, @mmaechler, #66); `isFALSE()` will
  eventually be removed from **xfun** when we do not need to support R
  < 3.5.0.