ltk patch for SBCL

[Douglas Katzman]

Please apply the following forward-and-backward compatible diff for SBCL.
closure-header-widetag is pending removed in the next release.

diff --git a/ginspect.lisp b/ginspect.lisp
index 3d448f8..a5ad37d 100644
--- a/ginspect.lisp
+++ b/ginspect.lisp
@@ -252,8 +252,7 @@
   (inspected-standard-object-elements object)))
 #+:sbcl
 (defmethod inspected-parts ((object function))
-  (let* ((type (sb-kernel:widetag-of object))
- (object (if (= type sb-vm:closure-header-widetag)
+  (let ((object (if (sb-kernel:closurep object)
      (sb-kernel:%closure-fun object)
      object)))
     (values (format nil "FUNCTION ~S.~@[~%Argument List: ~A~]." object
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