[core] Revert part of r39051; while in theory it's fine, it left us without a readline_interactive method, possibly because of a bad interaction between conditional compilation and pmc2c.
[core] Revert part of r39051; while in theory it's fine, it left us without a readline_interactive method, possibly because of a bad interaction between conditional compilation and pmc2c.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@39052 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot