[R-SIG-Mac] editline instead of readline in R-4.2 and R-4.3 builds

[Gábor Csárdi]

FYI, in case this was not intentional. G.

❯ R-4.1-arm64 -q -e 'extSoftVersion()["readline"]'
> extSoftVersion()["readline"]
readline
   "5.2"

❯ R-4.2-arm64 -q -e 'extSoftVersion()["readline"]'
> extSoftVersion()["readline"]
                readline
"4.2 (EditLine wrapper)"

❯ R-4.3-arm64 -q -e 'extSoftVersion()["readline"]'
> extSoftVersion()["readline"]
                readline
"4.2 (EditLine wrapper)"