Convert readline to Racket

Also lighten package dependencies by removing
scheme-lib and compatibility-lib.

pkgs/readline-pkgs/readline-lib/info.rkt

@@ -1,9 +1,7 @@
 #lang info
 
 (define collection 'multi)
-(define deps '("scheme-lib"
-               "base"
-               "compatibility-lib"))
+(define deps '("base"))
 
 (define pkg-desc "implementation (no documentation) part of \"readline\"")
 

pkgs/readline-pkgs/readline-lib/readline/main.rkt

@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 
 (require "rep.rkt")
 (provide (all-from-out "rep.rkt"))

pkgs/readline-pkgs/readline-lib/readline/mzrl.rkt

@@ -1,6 +1,6 @@
-#lang scheme/base
+#lang racket/base
 
-(require mzlib/foreign (only-in '#%foreign ffi-obj)) (unsafe!)
+(require ffi/unsafe (only-in '#%foreign ffi-obj))
 (provide readline readline-bytes
          add-history add-history-bytes
          history-length history-get history-delete

pkgs/readline-pkgs/readline-lib/readline/readline.rkt

@@ -1,3 +1,3 @@
-(module readline mzscheme
+(module readline racket/base
   (require "mzrl.rkt")
-  (provide (all-from "mzrl.rkt")))
+  (provide (all-from-out "mzrl.rkt")))

pkgs/readline-pkgs/readline-lib/readline/rep-start.rkt

@@ -1,7 +1,7 @@
 ;; This module initializes readline unconditionally, "rep.rkt" uses it if we're
 ;; using a `terminal-port?' for input.
 
-#lang scheme/base
+#lang racket/base
 
 (require "pread.rkt")
 

pkgs/readline-pkgs/readline-lib/readline/rep.rkt

@@ -1,7 +1,7 @@
 ;; This is a wrapper around "rep-start.rkt" -- use it if we're using a terminal
-#lang scheme/base
+#lang racket/base
 
-(require scheme/runtime-path scheme/file)
+(require racket/runtime-path racket/file)
 
 (define-runtime-path rep-start "rep-start.rkt")