docbook-xsl-ns: cleanup last patch

Doh.

pkgs/data/sgml+xml/stylesheets/xslt/docbook-xsl/docbook-xsl-ns-infinite.patch

@@ -5,7 +5,7 @@ URL: https://github.com/NixOS/nixpkgs/issues/39090
 diff -ru a/lib/lib.xsl b/lib/lib.xsl
 --- a/lib/lib.xsl	2015-12-26 15:15:37.000000000 -0800
 +++ b/lib/lib.xsl	2018-03-22 11:52:45.311949264 -0700
-@@ -11,8 +11,11 @@
+@@ -11,8 +11,10 @@
  
       ******************************************************************** -->
  <xsl:stylesheet exclude-result-prefixes="d"
@@ -14,7 +14,6 @@ diff -ru a/lib/lib.xsl b/lib/lib.xsl
 +                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 +                xmlns:d="http://docbook.org/ns/docbook"
 +                xmlns:str="http://exslt.org/strings"
-+                exclude-result-prefixes="str"
 +                version="1.0">
  
  <xsl:template name="dot.count">