remove duplicate when/unless definitions

* module/rnrs/control.scm:
* module/sxml/ssax.scm:
* test-suite/lalr/common-test.scm: Remove local `when'/`unless'
  definitions.

module/rnrs/control.scm

@@ -1,6 +1,6 @@
 ;;; control.scm --- The R6RS control structures library
 
-;;      Copyright (C) 2010 Free Software Foundation, Inc.
+;;      Copyright (C) 2010, 2012 Free Software Foundation, Inc.
 ;;
 ;; This library is free software; you can redistribute it and/or
 ;; modify it under the terms of the GNU Lesser General Public
@@ -19,14 +19,4 @@
 
 (library (rnrs control (6))
   (export when unless do case-lambda)
-  (import (only (guile) if not begin define-syntax syntax-rules do case-lambda))
-
-  (define-syntax when
-    (syntax-rules ()
-      ((when test result1 result2 ...)
-       (if test (begin result1 result2 ...)))))
-
-  (define-syntax unless
-    (syntax-rules ()
-      ((unless test result1 result2 ...)
-       (if (not test) (begin result1 result2 ...))))))
+  (import (only (guile) when unless do case-lambda)))

module/sxml/ssax.scm

@@ -1,6 +1,6 @@
 ;;;; (sxml ssax) -- the SSAX parser
 ;;;;
-;;;; 	Copyright (C) 2009, 2010  Free Software Foundation, Inc.
+;;;; 	Copyright (C) 2009, 2010,2012  Free Software Foundation, Inc.
 ;;;;    Modified 2004 by Andy Wingo <wingo at pobox dot com>.
 ;;;;    Written 2001,2002,2003,2004 by Oleg Kiselyov <oleg at pobox dot com> as SSAX.scm.
 ;;;; 
@@ -209,13 +209,6 @@ string @var{str}, which will then be parsed."
   (set! ssax:predefined-parsed-entities
         (acons entity str ssax:predefined-parsed-entities)))
 
-;; if condition is true, execute stmts in turn and return the result of
-;; the last statement otherwise, return #f
-(define-syntax when
-  (syntax-rules ()
-    ((when condition . stmts)
-      (and condition (begin . stmts)))))
-
 ;; Execute a sequence of forms and return the result of the _first_ one.
 ;; Like PROG1 in Lisp. Typically used to evaluate one or more forms with
 ;; side effects and return a value that must be computed before some or

test-suite/lalr/common-test.scm

@@ -8,13 +8,6 @@
 
 (define *error* '())
 
-(define-syntax when
-  (syntax-rules ()
-    ((_ ?expr ?body ...)
-     (if ?expr
-	 (let () ?body ...)
-       #f))))
-
 (define-syntax check
   (syntax-rules (=>)
     ((_ ?expr => ?expected-result)