gnu: docbook: Remove leftovers.

docbook-xsl patches are probably remnants from
1f7d94597f.

* gnu/packages/docbook.scm: Remove unused import.
* gnu/packages/patches/docbook-xsl-nonrecursive-string-subst.patch: Remove.
* gnu/packages/patches/docbook-xsl-support-old-url.patch: Ditto.
* gnu/local.mk: Unregister it.
* gnu/packages/moreutils.scm (moreutils)[native-inputs]: Drop obsolete
comment.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/local.mk

@@ -1124,8 +1124,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/diffutils-fix-signal-processing.patch	\
   %D%/packages/patches/directfb-davinci-glibc-228-compat.patch	\
   %D%/packages/patches/dkimproxy-add-ipv6-support.patch		\
-  %D%/packages/patches/docbook-xsl-nonrecursive-string-subst.patch	\
-  %D%/packages/patches/docbook-xsl-support-old-url.patch	\
   %D%/packages/patches/doc++-include-directives.patch		\
   %D%/packages/patches/doc++-segfault-fix.patch			\
   %D%/packages/patches/dovecot-opensslv3.patch			\

gnu/packages/docbook.scm

@@ -47,7 +47,6 @@ (define-module (gnu packages docbook)
   #:use-module (guix git-download)
   #:use-module (guix build-system copy)
   #:use-module (guix build-system gnu)
-  #:use-module (guix build-system trivial)
   #:use-module (guix build-system python))
 
 ;; The fetch-plan, install-plan and phases for docbook-xml tend to vary

gnu/packages/moreutils.scm

@@ -71,7 +71,7 @@ (define-public moreutils
     ;; For building the manual pages.
     (native-inputs
      (list docbook-xml-4.4
-           docbook-xsl     ;without -next, man pages are corrupted
+           docbook-xsl
            libxml2
            libxslt))
     (home-page "https://joeyh.name/code/moreutils/")

gnu/packages/patches/docbook-xsl-nonrecursive-string-subst.patch

@@ -1,40 +0,0 @@
-Use a non-recursive replace function when the parser supports it.
-
-https://bugs.gnu.org/29782
-https://bugzilla.samba.org/show_bug.cgi?id=9515
-https://bugzilla.gnome.org/show_bug.cgi?id=736077 (for xsltproc)
-
-Patch copied from Debian:
-https://salsa.debian.org/debian/docbook-xsl/-/blob/master/debian/patches/765567_non-recursive_string_subst.patch
-
-Description: use EXSLT "replace" function when available
- A recursive implementation  of string.subst is problematic,
- long strings with many matches will cause stack overflows.
-Author: Peter De Wachter <pdewacht@gmail.com>
-Bug-Debian: https://bugs.debian.org/750593
-
---- a/lib/lib.xsl
-+++ b/lib/lib.xsl
-@@ -6,7 +6,11 @@
- 
-      This module implements DTD-independent functions
- 
--     ******************************************************************** --><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
-+     ******************************************************************** -->
-+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-+                xmlns:str="http://exslt.org/strings"
-+                exclude-result-prefixes="str"
-+                version="1.0">
- 
- <xsl:template name="dot.count">
-   <!-- Returns the number of "." characters in a string -->
-@@ -52,6 +56,9 @@
-   <xsl:param name="replacement"/>
- 
-   <xsl:choose>
-+    <xsl:when test="function-available('str:replace')">
-+      <xsl:value-of select="str:replace($string, string($target), string($replacement))"/>
-+    </xsl:when>
-     <xsl:when test="contains($string, $target)">
-       <xsl:variable name="rest">
-         <xsl:call-template name="string.subst">

gnu/packages/patches/docbook-xsl-support-old-url.patch

@@ -1,17 +0,0 @@
-Docbook 1.79.2 makes very few changes apart from changing the canonical URL
-to cdn.docbook.org.  This patch adds support for the previous URL to avoid
-breaking packages that still use that.
-
-Adapted from Debian:
-https://salsa.debian.org/debian/docbook-xsl/-/blob/master/debian/patches/0005-catalog.xml-Compatibility-with-1.79.1-or-earlier.patch
-
---- a/catalog.xml
-+++ b/catalog.xml
-@@ -5,4 +5,7 @@
-   <rewriteSystem systemIdStartString="http://cdn.docbook.org/release/xsl/current/" rewritePrefix="./"/>
-   <rewriteURI uriStartString="http://cdn.docbook.org/release/xsl/1.79.2/" rewritePrefix="./"/>
-   <rewriteSystem systemIdStartString="http://cdn.docbook.org/release/xsl/1.79.2/" rewritePrefix="./"/>
-+  <!-- Also support old URI of v1.79.1 or earlier -->
-+  <rewriteURI uriStartString="http://docbook.sourceforge.net/release/xsl/current/" rewritePrefix="./"/>
-+  <rewriteSystem systemIdStartString="http://docbook.sourceforge.net/release/xsl/current/" rewritePrefix="./"/>
- </catalog>