Backport readline-6.3 support

Ruby Development
#1

Issue #9630 has been updated by Hiroshi SHIBATA.

and r45518

Backport #9630: Backport readline-6.3 support.
https://bugs.ruby-lang.org/issues/9630#change-46379

  • Author: Hiroshi SHIBATA
  • Status: Open
  • Priority: Normal
  • Assignee: