gnu: Remove dangling variable.

* gnu/packages/xml.scm (libxslt/fixed): Remove.

gnu/packages/xml.scm

@@ -200,15 +200,6 @@ project (but it is usable outside of the Gnome platform).")
 based on libxml for XML parsing, tree manipulation and XPath support.")
     (license license:x11)))
 
-(define libxslt/fixed
-  (package
-    (inherit libxslt)
-    (source (origin
-              (inherit (package-source libxslt))
-              (patches (search-patches "libxslt-CVE-2016-4738.patch"
-                                       "libxslt-CVE-2017-5029.patch"
-                                       "libxslt-generated-ids.patch"))))))
-
 (define-public perl-graph-readwrite
   (package
     (name "perl-graph-readwrite")