Fix conditionalization in CLSQL under LispWorks 7.0

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Hi CLSQL maintainers,

The attached patch fixes an incorrect conditionalization in CLSQL, to allow
compilation under LispWorks 7.0.  Using "negative" feature expressions ensures
forward compatibility for this kind of test.

-- 
Martin Simmons
LispWorks Ltd
http://www.lispworks.com/

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diff --git a/sql/utils.lisp b/sql/utils.lisp
index be1396e..375c9fd 100644
--- a/sql/utils.lisp
+++ b/sql/utils.lisp
@@ -100,8 +100,8 @@
 =

 #+lispworks
 (defvar +lw-has-without-preemption+
-  #+lispworks6 nil
-  #-lispworks6 t)
+  #-(or lispworks5 lispworks4) nil
+  #+(or lispworks5 lispworks4) t)
 #+lispworks
 (defvar +lw-global-lock+
   (unless +lw-has-without-preemption+

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