Use GNU readline as our base readline lacks rl_prefer_env_winsize.

Index: configure
--- configure.orig
+++ configure
@@ -80591,7 +80591,7 @@ printf "%s\n" "$as_me: WARNING: $warn_rapidjson" >&2;}
 
 fi
 
-### Check for readline library.
+### Check for ereadline library.
 
 
   TERM_LIBS=
@@ -80694,14 +80694,14 @@ fi
 
     ac_octave_save_LIBS="$LIBS"
     LIBS="$TERM_LIBS"
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for rl_set_keyboard_input_timeout in -lreadline" >&5
-printf %s "checking for rl_set_keyboard_input_timeout in -lreadline... " >&6; }
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for rl_set_keyboard_input_timeout in -lereadline" >&5
+printf %s "checking for rl_set_keyboard_input_timeout in -lereadline... " >&6; }
 if test ${ac_cv_lib_readline_rl_set_keyboard_input_timeout+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
   ac_check_lib_save_LIBS=$LIBS
-LIBS="-lreadline  $LIBS"
+LIBS="-lereadline  $LIBS"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -80739,7 +80739,7 @@ fi
 printf "%s\n" "$ac_cv_lib_readline_rl_set_keyboard_input_timeout" >&6; }
 if test "x$ac_cv_lib_readline_rl_set_keyboard_input_timeout" = xyes
 then :
-  READLINE_LIBS="-lreadline"
+  READLINE_LIBS="-lereadline"
 
 printf "%s\n" "#define USE_READLINE 1" >>confdefs.h